Steel Tanks (Cylinders)

Because there are so many choices, even experienced divers can become confused by the latest features and diving applications of scuba tanks. If that's you, then you might benefit from reading the most popular article on our website. How to Select a SCUBA Tank is a very detailed whitepaper focused on helping divers choose the best SCUBA tank for their specific needs and styles of diving.

We strongly recommend purchasing our cylinders ONLY for use in North America and the Caribbean. All our cylinders have United States DOT and Canadian CTC testing and crown markings along with Imperial neck thread forms. The cylinders are NOT marked appropriately for use in Australia and New Zealand. Testing and marking specifications, neck thread forms, and over pressure relief device requirements in many other areas of the globe (especially Europe) are different than North American standards.

The bottom line is that all SCUBA tanks will have cosmetic imperfections from the factory supply chain and recently their cosmetic quality has noticeably declined. The recreational dive industry has long been accustomed to a "consumer grade" finish on SCUBA cylinders. However, recent changes in the marketplace means new SCUBA cylinders may often present with what could be charitably described as an "industrial grade" internal and/or external surface appearance that is similar to what is typical of bulk supply cylinders. The surfaces can have streaks of discoloration, spotting, scratches, abrasions, oxidation, and other irregularities as a byproduct of manufacturing, testing, handling and shipping.

Currently, all the cylinder manufacturers are adamant in maintaining the position that their SCUBA cylinders are O2 clean and fit for purpose as delivered from the factory. This puts the distributors and retailers of SCUBA cylinders between a "between a rock and a hard place" when consumers or untrained "inspectors" object to the appearance. If the distributor or retailer does any modifications (such as further cleaning, polishing, tumbling, or grinding) to the brand new cylinder warranted as O2 clean and fit for purpose from the manufacturer, then legal responsibility for the condition of the cylinder shifts to the aftermarket service provider. A cylinder with aftermarket treatments also technically can no longer be represented as new and O2 clean from the factory. Most retailers choose to follow the experts in this circumstance - the manufacturer plus the independent testing agency plus the certified cylinder visual inspector that all warrant a brand new and unused cylinder is fit for purpose.

With just minimal care, all tanks regardless of their cosmetics will deliver many years of service. We occasionally encounter consumers who seem prioritize the cosmetic appearance of their tanks over more significant considerations. Our practice regarding new cylinders the customer deems cosmetically unacceptable is we will accept returns (according to our Returns & Refunds policy) but will not make exchanges given the likelihood a replacement will be no better cosmetically than the original. Since the shipping on cylinders is not free, our advice to those consumers is they should reconsider their priorities. Otherwise, if cosmetics is important to ownership, they might prefer renting tanks rather than owning or purchasing locally where they may personally inspect before purchase.

In the Summer 2022, the Metal Impact brand name was transitioned to the Thunderbird brand of their parent corporation, Thunderbird Cylinders (which also acquired Luxfer brand aluminum SCUBA cylinder assets), but the cylinders are otherwise unchanged. The exclusive North American distributor for Thunderbird SCUBA cylinders is now XS Scuba, which also owns Sea Pearls. You may find references to any of these names on our website, but they are all referring to what are essentially the same aluminum SCUBA cylinder products that are all manufactured in the USA.

In the US and Canada, SCUBA Tanks must be hydrostatically tested every five years (60 months) and we always ship cylinders with the absolute most current test date available to us. Most cylinders have a factory test date less than 12 months old. Less popular sizes of cylinders may have a slightly older factory test date as these are manufactured infrequently.

Yes, they will be assembled and ready to fill, if shipped via ground service within the continental United States. Transportation security and customs regulations require cylinders that ship via air transport to be obviously empty and easily inspected. Effectively that means the cylinder and valve cannot be assembled if shipping to an international address (including Canada) or via any expedited shipping method.

If you are arranging to have your cylinders delivered to a third-party package forwarder for subsequent handling, you may wish to request on your order that we do NOT assemble your cylinders and valves.

No, due to weight restrictions our doubles packages ship as individual components ready-to-assemble: two cartons containing the cylinders (and boots for those packages that include boots) with modular valves (including port plugs) installed in the cylinders hand tight along with a third carton containing the manifold crossbar, bands and bolt kit, two loose Evidence of Inspection decals (aka VIP stickers.). You will need to assemble the package yourself prior to filling or if you prefer arrange for a local dive shop to assemble them for a fee. Assembling a set of doubles is easy if you follow our detailed doubles assembly instructions.

All cylinders and valves sold by us, that we describe as Nitrox Ready, are oxygen clean from the supplier. Based on oxygen handing best practices, Dive Gear Express does not use any form of lubricant during valve installation. That means all Nitrox Ready SCUBA tanks sold and assembled by Dive Gear Express, prior to initial use, are still oxygen clean from the supplier; we have done nothing to change that condition.

In rare cases, a shop will insist on some form of after-market "cleaning" before agreeing to fill a tank not sold by them. They have that right, but we want you to know that no such service can make a new empty cylinder and valve from Dive Gear Express any more oxygen clean.

Every tank we sell is inspected by us immediately prior to shipment and all our technicians are PSI-PCI certified to perform such inspections. If the cylinder is ordered with valve and VIP, we include our shop evidence of inspection 3" X 6" month and year dated decal (aka "VIP sticker") that clearly indicates "Nitrox Ready" in large yellow letters on a green background. However, If the cylinder is ordered with the "No Valve / No VIP" option then our evidence of inspection decal is not included even though the cylinder itself is always inspected.

No, our tanks don't include the Large Nitrox Tank Wrap Decal used to indicate gas contents. If the cylinder is ordered with valve and VIP, we include our shop evidence of inspection month and year dated decal (aka "VIP sticker") that clearly indicates "Nitrox Ready". However, the VIP sticker is not used to indicate the gas contents and Nitrox Ready does not mean there is actually Nitrox gas in the tank. The tank wrap can be ordered separately, however please read our TekTip titled Do I really need that big NITROX wrap decal on my tank?

Yes you can, but we don't recommend it for two reasons. We buy the cylinders with a valve at a discounted bundle price and we pass that discount on to you. If you wish to purchase the cylinder without the valve then the reduction in price we can offer is a meager $30.00 considering the price of the valve and a VIP when sold separately. While we always inspect the cylinder before shipping, if there is no valve then we can't provide a VIP decal because it only applies to both the cylinder and valve together. It only makes sense to purchase without valve when you have absolutely no use for the valve and don't need the VIP decal.

The CCR Cylinders and Valves in our Rebreather category have differences in their configuration than those in our Gas-Tanks category. The cylinders and valves themselves are physically the same in both categories; equally oxygen compatible and oxygen clean. However, the CCR cylinder selections are only appropriate for rebreather in-board mounting and include options to add Oxygen/Diluent contents decals. Cylinders configured for CCR will ship with the VIP decal unaffixed so it can be later applied to the cylinder wall in a location unobstructed by rebreather tank mounting systems. The CCR valve configuration options include our specialized versions typically only seen on rebreathers, along with options to select knob color and do not include a No Valve/No VIP option. Rebreathers only use DIN regulator fittings, so the included valve accessories for CCR are a threaded dust plug rather than a vinyl cap and do not include a DIN-to-Yoke insert adapter.

The "Rejection Elastic Expansion" (REE) number stamped on the crown of some steel SCUBA cylinders is the maximum volume in cubic centimeters the manufacturer specifies the cylinder may expand during a hydrostatic pressure test. It is guidance to the tester and of no significant concern to divers. The REE number, if present, is NOT the free air capacity of the cylinder.

Yes, but it's meaning is often misunderstood. Our low pressure steel cylinders are DOT-3AA-2400 design i.e. their fill pressure is considered to be 2400 psi by the US Department of Transportation rules. When we talk about LP cylinders having a 2640 service pressure, that is always 2400 + 10% overfill = 2400 + 240 = 2640 psi. It does NOT mean a 10% overfill on the 2640 psi service pressure.

If 3AA design cylinders can pass a elastic expansion evaluation during hydro testing then they qualify for a "+" stamped next to the hydro date. That "+" means they may receive a 10% overfill. This overfill allowance was instituted to improve material capacity during war time almost a century ago, but the rule remains in effect today. New cylinders will always pass, but although rare do fail on later tests, especially those that have been consistently overfilled. Many hydro test facilities will not stamp the "+" on subsequent tests after the first, because frankly the DOT prefers the + not be used.

No, but don't worry - we will completely seal your cylinder so that it will arrive with a factory oxygen clean interior. We sometimes receive this question based on the mistaken belief that filling the cylinder is necessary to protect the interior from contamination or moisture, however the US Department of Transportation says any SCUBA tank containing compressed gas can not legally be shipped via ordinary parcel delivery services.

If the cylinder and valve was assembled by Dive Gear Express with our Nitrox Ready evidence of inspection decal (aka "VIP sticker"), then your oxygen clean and oxygen compatible tank is ready to fill without further preparation. Although local dive shop fill policies vary, there should be no safety related reason for objecting to initially filling the empty SCUBA tank with oxygen compatible grade Air or Nitrox. However, shops often enforce training agency requirements or community practices for labeling, which may require additional specific gas contents or MOD decals be affixed to the tank.

YES, you can take empty SCUBA tanks on airplanes. However, the Transportation Security Administration (TSA) has some very specific inspection conditions for tanks to be permitted in aircraft. For details, please see our TekTip Advice for Flying with SCUBA tanks.

Dive shops following best practices will not fill cylinders marked as being oxygen clean with ordinary CGA grade "E" compressed gases typical of most dive shop fill stations. In this case, the fill station operator can simply remove our Nitrox Ready decal and replace it with one they prefer. If you wish to order any of our tanks intending to use them strictly for air only, then upon request we can substitute an "Air Only" black and white version of our shop evidence of inspection decal (aka "VIP Sticker").

Quick Reference for 232 bar cylinders:
18L (141 ft³) and 15L (117 ft³) = 8-inch (large);
12L (95 ft³), and 10L (78 ft³) = 7-inch (standard);
7L (54 ft³) and 5L (39 ft³) = 5-inch (small).

These are simple approximations, for more detailed explanations please read our article Metric vs Imperial SCUBA Cylinder Sizes.

Yes and no; this simple question has a complex answer because there is no widely recognized scuba diving standard for what constitutes suitability for oxygen service. Hypothetically, the equipment we sell could be used with oxygen if we describe it as Nitrox Ready, otherwise you should assume air only service. However, from the point of view of stringent U.S. aerospace guidelines and Compressed Gas Association handling standards for oxygen, nothing in general use in recreational diving is suitable for oxygen service. Using oxygen for diving requires you to make an informed decision to accept for yourself the risks of handing the oxygen. To help form your opinion about the answer read our article About Oxygen Disclaimers.

According to our suppliers, their Nitrox Ready products are oxygen compatible and oxygen clean from the factory, prior to initial use, for compressed gases greater than 23.5% oxygen. (Air is defined as containing from 19% to 23.5% oxygen.) However, most suppliers in the dive industry specify their Nitrox Ready products for use with gas mixtures containing a maximum of 40% oxygen as the upper limit. Although controversial, some dive industry professionals are of the opinion that Nitrox Ready products do not have to be dedicated to oxygen service and may be used interchangeably with CGA Grade "E" air as long as the Nitrox Ready product never contacts gas mixtures in excess of 40% oxygen.

To better understand the issues associated with handling oxygen rich compressed gas, please read Understanding Nitrox Ready.

The 40% specification has become widely used in the recreational diving industry to reduce risk to safety of the diver and limit manufacturer liability, yet indicate a product is (at least initially) oxygen compatible and oxygen clean. For more information please read About Oxygen Disclaimers.

Since Air is defined by the CGA as containing 19% to 23.5% oxygen, describing nitrogen-oxygen gas mixtures up to 23.5% as Nitrox is just an obscure way of describing ordinary Air. Gas mixtures greater than 23.5% oxygen are what most people assume to be Nitrox, and of course there is also pure Oxygen. To avoid conflict with various dive supplier labeling and any misunderstanding about exactly what constitutes Nitrox, Dive Gear Express sometimes uses the phrase "suitable for service with compressed gases containing greater than 23.5% oxygen" to describe products that are both oxygen compatible and oxygen clean prior to initial use, especially in reference to cylinders and valves.

There are several versions of a dive tank VIP decal for sport Nitrox & Oxygen service that is widely available to anyone who wishes to purchase them online from Amazon and eBay. They typically have a punch out described as "cleaned for PREMIX oxygen content 22% to 40%". We will be blunt and clearly state these decals are meaningless; they have no provenance and reference no standards as well as being dangerously inaccurate. Local dive shops following best practice will not normally honor this type of VIP decal.

"Oxygen clean" is described as: the flow path and material surfaces which meet standards for absence of contaminates that can become a source for ignition. There are no diving-related industry-wide consensus or peer reviewed standards for the handling of the specialty compressed gases used in diving. So the dive industry has to fall back on the standards and guidelines of other industries. In the US, they are established and maintained primarily by the Compressed Gas Association (CGA). The CGA states that equipment and systems handling any gas in excess of 23.5% oxygen by volume shall be cleaned as if the gas was PURE oxygen. The CGA pamphlet G4.1 "Cleaning Equipment for Oxygen Service" describes the methods for cleaning and then testing the cleanliness of equipment used with oxygen.

Our suppliers tell us their cylinders and valves are oxygen clean from the factory. The CGA states that equipment handling any Nitrox mixture in excess of 23.5% oxygen shall be cleaned to their standard as if the gas is 100% oxygen, there is no lesser standard. That means all SCUBA tanks sold and assembled by Dive Gear Express that we label as Nitrox Ready on our VIP decal, prior to initial use, are oxygen clean from the supplier; we have done nothing to change that condition. Nitrox Ready tanks are not just 'kinda sorta clean' or 'premix clean', they are oxygen clean to CGA standards. For more information please read About Oxygen Disclaimers.

In rare cases, a shop will insist on some form of after-market "cleaning" before agreeing to fill a tank not sold by them. They have that right, but we want you to know that no such service can make a new empty cylinder and valve marked Nitrox Ready from Dive Gear Express any more oxygen clean.

Our suppliers tell us their equipment described as Nitrox Ready is already oxygen clean from the factory. The Compressed Gas Association standards state that equipment handling any Nitrox mixture in excess of 23.5% oxygen shall be cleaned to their standard as if the gas is pure oxygen, there is no lesser standard. That requirement is why Nitrox Ready equipment has already been oxygen cleaned by the manufacturer. SCUBA equipment is labeled 'NITROX READY' or '40% MAX OXYGEN' instead of 'Oxygen Service' because the manufacturers are managing the risks, both to your safety and their liability, associated with oxygen-related fires and explosions by specifying their SCUBA products for use only with breathing gas mixtures no more than 40% oxygen.

Nitrox Ready and Oxygen Service equipment from our suppliers is not just 'kinda sorta clean' or 'premix clean', it is oxygen clean. The practice by shops and individuals of aftermarket cleaning for new dive equipment that is already oxygen clean from the factory is pointless at best and dangerous if done improperly. Prior to initial use, no amount of aftermarket cleaning can make a Nitrox Ready product more oxygen clean nor can cleaning it ever override the manufacturer specified limits. The manufacturer can't stop you from using their equipment with breathing gases and pressures that exceed their specifications, but doing that requires you to make an informed decision to accept for yourself the risks of handing the oxygen.

Our oxygen compatible O-rings are typically made of fluorocarbon elastomer (aka fluoroelastomer, aka FKM, aka FPM) A-Type material. FKM is the designation for a class of fluorocarbon based synthetic rubbers as defined by ASTM standards, equivalent to FPM by ISO standards. Originally developed by DuPont under the name Viton, FKM is a high performance elastomer with excellent resistance to oxygen. In a few specific cases our O-rings might be described as made from a different oxygen-compatible material, for example EPDM.

Many people refer to any and all oxygen compatible O-rings as "viton" in the same manner that the Kimberly-Clark brand name Keenex has become synonymous with tissues. However, Viton™ is now The Chemours Company trademark brand name for their fluoroelastomers and use of the brand name requires joining their licensing program. Chemours is not the only company that manufactures FKM products and there are different types intended for various different applications. Counterfeit and mislabeled FKM A-Type material O-rings are so widespread that Dive Gear Express makes up our own kits using O-rings supplied through trustworthy channels. We use the generic terms fluorocarbon elastomer or FKM to describe our O-rings, not the brand name Viton.

There is no reliable visual inspection method to determine O-ring material composition, only specialized materials testing equipment can make that determination. Acrylonitrile butadiene rubber elastomers (aka NBR, aka Nitrile, aka Buna-N) are considered to have good resistance to oxygen with a 15 year shelf life. Fluorocarbon elastomers (aka FKM, aka FPM, aka Viton™) are considered to have excellent resistance to oxygen, with an essentially unlimited shelf life. To ensure specific composition, O-ring material must be specified at time of purchase and then segregated from other O-rings.

There are no O-ring color coding standards and thus color or appearance is not an indication of the material or quality. O-rings are available in nearly any color, although most commonly seen in black regardless of material. Even though most fluorocarbon O-rings are black, the loose FKM O-rings sold by Dive Gear Express are oxygen compatible and usually brown or green; simply to make them easily distinguishable from more common NBR O-rings which are usually black. However, O-rings inside equipment (valves, regulators, hoses, service kits, etc.) are almost always black regardless of material. O-ring materials also can not be distinguished from each other by their surface appearance, more a function of the manufacturer than the material. NBR is incorrectly said to have a shiny surface and FKM a matte surface. This is not a reliable indicator, and certainly not true if the O-ring has been lubricated.

Just to be clear, the COLOR and SURFACE APPEARANCE of the O-ring is MEANINGLESS regarding their compatibility with oxygen.

Yes. Many divers are surprised to learn the SCUBA industry convention of using fluorocarbon elastomers (FKM or FPM, aka Viton™ o-rings) with Nitrox is not a matter of oxygen fire safety. The introduction of Nitrox in recreational diving included a recommendation to use FKM for seals in gas blending equipment whose wetted surfaces contact pure Oxygen. This was frequently confused with the very important safety requirement for oxygen cleanliness (i.e. the absence of readily combustible materials); creating a mistaken but widely held belief that FKM is also somehow related to safety of Nitrox for diving equipment such as SCUBA regulators and cylinder valves.

FKM is no more 'safe' in Nitrox diving applications than ordinary synthetic nitrile rubber (NBR aka Buna-N). While FKM has a slightly higher temperature of ignition at {~ 900°F | 500°C} than NBR at {~ 750°F | 400°C}, nearly any material can still serve as fuel in the kindling chain to an oxygen fire that will reach {~ 5000°F | 2700°C}. The reason for preferring FKM in high oxygen content applications is because the service life is typically longer than NBR, i.e. FKM is more resistant to oxidation than nitrile rubber although FKM also exhibits a tendency to swell slightly in high-pressure oxygen. While FKM o-rings theoretically outperform NBR o-rings, in practice there is no safety reason to prefer them in Nitrox SCUBA life-support applications such as regulators and valves given the periodic service requirements of such equipment.

Regardless, Dive Gear Express specifies oxygen compatible and oxygen clean products whenever possible, and we only use O2 compatible O-rings and lubricants in equipment service. Any products we identify as Nitrox Ready or Oxygen Service will meet industry standards for both oxygen compatibility and oxygen cleanliness prior to initial use.

The short answer is NO. The longer answer is it depends on the exact product formulation and gas pressure but as a practical matter the answer is still no. Silicone "grease" is a generic term for a variety of lubricant formulations that are based on some form of pure silicone oil, most commonly polydimethylsiloxane (PDMS). While pure PDMS itself is a chemically inert inorganic substance that is not combustible; in order to make the little tub or spray can of generic 'scuba lube', the PDMS is mixed with thickeners and/or organic solvents that typically are readily combustible. Lubricant contamination in high pressure compressed gas equipment is a frequent cause of oxygen fires. In general, lubrication in oxygen service applications should be avoided whenever possible. Oxygen service applications in SCUBA that require lubrication must use specialized (and relatively expensive) lubricants, typically based on polytetrafluoroethylene (PTFE) or polychlorotrifluoroethylene (PCTFE) compounds.

It is true that in low pressure Nitrox applications such as regulator second stages and rebreather loops, the type of lubricant is pretty much irrelevant to oxygen fire safety. Occasionally, the desire to minimize use of expensive oxygen compatible lubricants can lead to the erroneous assumption that inexpensive silicone lubricants might used in ambient or low pressure applications that are in close proximity to high pressure applications. However, the high tack and adhesion property of silicone lubes also makes them very migratory and difficult to completely remove. In practice, we find silicone lubrication on the low pressure side of equipment will eventually be transferred to the high pressure side such as a first stage connector or valve outlet. Never use silicone lubricants with electrical contacts, even though this is an often suggested practice. Silicone products will react with plastics and other contaminates to form insulating films and silicone carbide compounds which can cause intermittent connections in low-current applications such as rebreather oxygen sensors. When multiple lubricants are available, there is also the very real increased risk of inadvertently applying the wrong lubricant. In practice, if lubrication is required it is best to only use oxygen compatible lubricant consistently throughout all equipment in service with Nitrox regardless of pressure.

Dive Gear Express avoids silicone lubricants in our facility, using only oxygen compatible lubricants for all SCUBA applications that require lubrication. Any products we identify as Nitrox Ready or Oxygen Service will meet industry standards for both oxygen compatibility and oxygen cleanliness prior to initial use.

DOT regulations currently limit the oxygen fill pressure of aluminum and composite cylinders to 3,000 psi at 70F. There are no similar DOT fill pressure limits for compressed oxygen gas in steel cylinders, but as a practical matter pure oxygen fills exceeding 3,000 psi are highly unlikely, regardless of cylinder composition or service pressure. In the US, almost all bulk compressed oxygen available to local dive shops is aviation grade in steel DOT-3AA-2400 cylinders with a CGA-540 valve at a service pressure of 2,640 psi. Since most oxygen fills by local dive shops are done using the cascade method, a typical local dive shop pure oxygen fill in a rebreather or decompression cylinder will be between 1,800 psi and 2,400 psi unless the shop has an oxygen booster.

The DOT considers any gas containing more than 23.5% oxygen to be pure oxygen for the purposes of handling. Thus, knowledgeable fill station operators will not fill aluminum cylinders with Nitrox higher than 3,000 psi. This means the 3300 psi "compact" or "neutral buoyancy" aluminum SCUBA cylinders will receive a short fill. Again, there are no such restrictions on Nitrox in steel high pressure SCUBA cylinders with a service pressure of 3442 psi. Although there are some older steel SCUBA cylinders with a service pressure of 3500 psi, recent DOT regulations limit the transport of such cylinders to a maximum fill pressure of 3442 psi as well.

We offer two different gas boosters suitable for applications with recreational diving; both are compressed air driven, air cooled, non-lubricated, reciprocating piston, single action single stage type. The DGX Gears X-30 is a value priced oxygen booster that is suitable for light duty usage. The faster Haskel MSB-9000 is a premium quality oxygen booster manufactured in the USA that is suitable for heavy duty usage in mission critical applications. A benefit of the Haskel booster is additional cooling provided by routing the cold exhausted drive air through a jacket surrounding the gas compression barrel.

Thermo™ SCUBA valves are manufactured in Taiwan and are distributed in the US by XS Scuba. The Thermo Pro DIN/K valve has been independently tested as meeting the CGA V9-2009 Compressed Gas Association Standard for Compressed Gas Cylinder Valves. The Thermo valves have a polished heavy chrome cosmetic finish and include a pre-installed DIN-to-Yoke adapter.

DGX Premium SCUBA valves are also manufactured in Taiwan. DGX Premium valves are available in an exceptionally wide variety of specialized versions. The DGX Premium valves have a satin chrome cosmetic finish. Our unbranded generic valves have a lower retail price as a result of being sourced directly from the manufacturer. Although the DIN-to-Yoke adapter is included with most cylinder and valve packages, when sold individually our DGX brand valves do not include a DIN-to-Yoke adapter. The adapter is always available separately as a low cost accessory.

There are internal differences (for example the bonnet nut seal on the Thermo uses a copper crush washer and the DGX uses an O-ring), but oxygen compatible materials and construction of the valves are similar for both Thermo and DGX. Both are described as Nitrox Ready, although Thermo valves are explicitly labeled "40% MAX OXYGEN PREMIXED" on the valve body. Our long experience with the branded Thermo and generic DGX Premium valves has been both have similar reliability and durability in the field. Regardless of brand, every product we sell is backed by Dive Gear Express 5-star quality customer service.

Our DGX Long Neck modular valves are about { 0.4 in | 1 cm } taller than our DGX Pro modular valves, but internal parts are identical. The design of the area between the outlet and the base, the 'neck', is more accessible in the Long Neck version. This advantage makes the Long Neck version more popular with sidemount divers who find the extra neck space more convenient to use with the sidemount bungee. The squat nature of the Pro modular valves offers a lower profile that is preferred by most overhead divers to reduce chance of impact on the valves and regulator first stages when wearing manifolded doubles. However, individuals who have restricted shoulder motion may find advantage in the extra height of the Long Neck valves making it a little easier to reach back to manipulate the knobs during S-drills. The disadvantage of the Long Neck version when worn with back mount single tanks is the divers head is more likely to touch the regulator first stage. As a general rule, if neither of the Long Neck advantages apply to your style of diving then there is no reason to prefer the Long Neck versions.

Probably. All of our replacement Nitrox Ready SCUBA valves have an inlet designed to fit 0.750-14 NPSM cylinder neck threads. This fits nearly all North American market SCUBA cylinders of recent manufacture, but there are some rare exceptions. Fortunately, you can use the cylinder neck stamp to determine the answer for yourself.

Assuming your cylinder was manufactured exclusively for the North American SCUBA market in the last 50 years or less, look at the cylinder neck for markings that begin "DOT". If it reads "DOT-3AL-xxxx", "DOT-3AA-xxxx", or "DOT-Xxxxx-3442" it almost certainly has an imperial 0.750-14 NPSM threaded neck opening, referred to in the trade as 3/4 NPS. SCUBA cylinders recently manufactured for other areas may have the name of their thread form stamped on the neck. If the neck stamp includes "3/4 NPSM" or "0.750-14" then the cylinder has a 0.750-14 NPSM threaded opening. Our replacement Nitrox Ready SCUBA valves will fit any of these cylinders.

There are some rare exceptions, especially for cylinders with very high service pressures or manufactured before 1970; for more information please read our article SCUBA Valves: Regulator Fittings, 200 vs 300 Bar FAQ and Cylinder Neck Threads.

The most common technical objections to the use of ordinary SCUBA valves with pure oxygen are: (1) too rapid a speed of opening and (2) chrome plating of the surfaces in contact with high pressure oxygen that are subject to friction or impact. The DGX Premium O2 valves are designed to answer these two specific objections. but otherwise similar to Nitrox Ready valves. For more information please read DGX Premium O2 Valve Differences.

The inlet and outlet on our oxygen compatible DGX Premium O2 Valves are oxygen clean copper metal alloy (aka raw "brass") which will very quickly exhibit some discoloration and spotting after cleaning that that is not present with electroplated chrome finishes typical of other SCUBA valves. Raw brass that is not coated with some kind of sealer (which would defeat the purpose of the valve) will discolor very rapidly, thus appearing aged or used.

If you consider the cosmetics to be important, and maximum compatibility with pure oxygen is less of a concern, then we recommend choosing our standard Nitrox Ready DGX Premium Valves over the DGX Premium O2 Valves.

All of our standard Nitrox Ready SCUBA valves will work with SCUBA regulators having yoke (aka A-clamp), 200 bar DIN or 300 bar DIN fittings. This is virtually all SCUBA regulators, with the rare exception of oxygen service M26 regulators sold in the European Union. The valves have a DIN outlet that requires an DIN-to-Yoke adapter insert for use with yoke regulators. The small DIN-to-Yoke adapter screws in to the DIN valve outlet and may remain permanently if you wish. Our Thermo brand valves include a pre-installed DIN-to-Yoke adapter at no charge. Our DGX house brand valves do not include the adapter, but a DIN-to-Yoke insert is available separately as a low cost accessory.

For more information please read our article SCUBA Valves: Regulator Fittings, 200 vs 300 Bar FAQ and Cylinder Neck Threads.

The Thermo brand valves have a little sticker on them (below the outlet) with a "service pressure" value. However, that value can be misleading to the point of being dangerous in some cases. It can be misleading because nothing prevents someone from inadvertently or deliberately installing a mismatched valve in a cylinder. A trained fill station operator following best practice will be guided by the markings on the crown of the cylinder not the label on the valve. Those permanently stamped markings on the cylinder itself determine the maximum fill pressure of the cylinder, not the service pressure label on the valve. The markings on the nut of the pressure relief device (PRD) installed in modern valves indicates release pressure of the PRD and not service pressure of the cylinder.

All the DIN-to-Yoke valve insert adapters for valves sold by Dive Gear Express use two #112 DIN O-rings, the same size as commonly found in DIN regulators. Regardless, if the adapter remains permanently in the valve, the rear O-ring rarely if ever needs replacing and only the face O-ring where the yoke regulator attaches needs to be changed. While the standard O-ring in yoke valves is a #014, the slightly 'fatter' #112 actually seals better and is less likely to extrude. For more information, see our O-rings page

We strongly recommend purchasing our valves ONLY for cylinders used in North America and the Caribbean. All cylinders in the United States and Canada have Imperial neck thread forms and the valves have over pressure relief devices (aka "burst disks"). Neck thread forms and over pressure relief device requirements in many other areas of the globe are different than North American standards.

One important caution regarding thread compatibility; outside the United States, particularly in Europe, a widely used SCUBA cylinder neck thread form is M25. The 3/4 NPSM (ISO 228) and M25 (BS 3643) threads are very similar but not identical; with the use of excessive force it's possible to mate diving cylinders and valves with these two different forms. However, the mismatched threads eventually separate with dangerously explosive force, often causing injury.

Detailed assembly and installation instructions, along with torque specifications and lubrication recommendations, can be found in our Installing the Valve in the Cylinder TekTip.

Yes, you can completely open our SCUBA cylinder valves and eliminate the archaic quarter-turn-back practice you probably learned in your open-water class. All SCUBA cylinder valves from Dive Gear Express are modern designs that protect both the valve stem seal and the valve seat when fully opened; the valves are not prone to leaking or sticking open. The dive industry is moving away from the quarter-turn-back practice because it has been proven to cause dive accidents. The Alert Diver article titled Old Habits Die Hard has a detailed explanation from DAN.

The handwheel shearing off the valve stem upon a right-angle impact is a design safety feature present on nearly all modern SCUBA valves, in order reduce the risk that the flow of gas could be interrupted or gas could be lost. Without even having to drain the tank, it's a simple process to replace the valve stem. This is a simple equipment maintenance task many divers can do themselves. Watch our YouTube video titled Valve Stem Replacement.

Nominal Pipe Size (abbreviated NPS) is a term for American standard pipe sizes widely used in the North American industrial trades, but does not describe specific thread forms. Confusingly, National Pipe Straight (also abbreviated NPS) is the name of a specific type of thread form described in American National Standard Pipe Thread standards. Just to be clear they are not the same, one NPS describes a standard for specific sizes of pipe and the other NPS describes a specific type of screw threads used on the ends of pipe.

Historically, many different screw threads have been used on SCUBA cylinder outlets and valves. Using the national pipe thread standards, the proper technical name of the parallel straight threads commonly used to mate modern SCUBA cylinders and valves for the North American market is 0.750-14 National Pipe Straight Mechanical, typically abbreviated as 0.750-14 NPSM. It is frequently also written as 3/4 NPS or 3/4-14; for the purposes of description with SCUBA cylinder and valve applications the terms may all be considered to reference the same threads: 0.750-14 NPSM has a 60° thread angle, a pitch diameter of 0.9820 to 0.9873 in (24.94 to 25.08 mm), and a thread pitch of 14 threads per inch (1.814 mm). The same thread form is also described in a variety of other standards such as ANSI, ASTM, and ISO but those other standards are very rarely referenced in the North American SCUBA market.

See our article SCUBA Valves for more information.

Yes, see our page Thermo Valve, 300 Bar DIN outlet with 7/8 UNF inlet threads.

Because we located in the United States , we do not sell SCUBA cylinder valves with the metric M25 inlet thread form. We only sell SCUBA valves for use with US DOT cylinders, which all have imperial neck thread forms and are required to incorporate an over pressure relief device not found on M25 valves.

The ISO3601 standard specification of the o-ring for the metric M25 scuba valve inlet threads is a slightly smaller (25mm) inside diameter, and a slightly smaller (3mm) cross section than the AS568 standard specification for the o-ring of the imperial 0.750-14 NPSM scuba valve inlet threads, which is 1 inch (25.4mm) inside diameter and 1/8 inch (3.175mm) cross section. However, the AS568-214 imperial o-ring is close enough in size to the M3.0X25.0 metric o-ring that most divers consider the imperial #214 o-ring a suitable substitute.

One important safety caution regarding thread compatibility: The 0.750-14 NPSM threads most commonly seen on SCUBA cylinders in the US and M25 threads most commonly seen outside the US (particularly European Union) are very similar but not identical; with the use of force it's possible to mate diving cylinders and valves with these two different forms. However, the mismatched threads eventually separate with dangerously explosive force, often causing injury.

No compatibility testing has been performed by the different manufacturers and neither Dive Gear Express, Dive Rite, nor XS Scuba (who also supplies the Thermo brand) recommend mixing components from different brands of valve modules. However, our customers tell us these valves have similar modular port threads and we have no reports of problems with crossbars, H-adapters and port plugs in that regard. The DIN-to-yoke adapter inserts along with the standard knobs, but not the Vindicator or XS Safety knobs, should be interchangeable without issues. Beyond cosmetics, we can also say for certain that some other internal parts of all four brands do have slight differences and are not interchangeable.