Apeks FSR Angled First Stage

The Apeks FSR flagship first stage is a unique over-balanced, diaphragm design - as the diver descends, the over-balancing feature allows the intermediate pressure gas in the hose to increase at a rate faster than ambient resulting in superb performance at extreme depths. The forged and polished chrome plated body has two standard high pressure 7/16-inch fixed angle ports plus four standard high-flow low pressure 3/8-inch fixed angle ports in an orientation that Apeks describes as being optimum for hose routing. An optional upgrade adds a 5th port to the end. The beefy body functions as a heat sink together with an environmental seal keeps water out of the main spring chamber thus preventing ice buildup and keeping silt and contamination out. The FSR is available with a choice of DIN or native Yoke connector and is Nitrox Ready.

Unique among the Apeks XTX series first stages, only the FSR has a removable ARCAP high-pressure seat crown. ARCAP is a high-tech metal alloy with very high tensile strength and is resistant to the effects of low temperatures and temperature change. The insulation from the surrounding environment provided by the beefy forged body, together with the replaceable HP seat made of the ARCAP alloy, makes the FSR even more adapted to diving in cold water.

When purchased separately, individual regulator stages remain as factory configured by the manufacturer and final integration must, out of necessity, become a customer responsibility. Please note that when this 1st stage is sold "raw" as received from the factory and not part of a package, it will have all but one of the LP ports plugged (i.e. one LP port will be open with a plastic dust cap) and the two HP ports will also be plugged.