Supplied by OmniSwivel International, this adapter offers a fixed 98° angle to connect a standard low pressure regulator hose having a standard 9/16-inch fitting to any standard second stage. OmniSwivel calls this device a low-pressure "elbow" but we would call it a low-pressure "pivot swivel". The swivel attaches between the regulator second stage and its low pressure hose, routing the hose down the diver's chest and/or under the arm, which increases comfort and streamlining. This low-profile adapter is not an omnidirectional swivel and so it maintains its angle and will not allow the regulator to flop around. Some people prefer the 98° adapter because it angles the hose very slightly away from the neck and face.