You cannot breathe directly out of a scuba tank because of the high pressure. A regulator reduces pressure to safe a level that can be inhaled by the diver. A diving regulator has two parts: the First Stage reduces the tank pressure and connects it to the Second Stage which contains the mouthpiece for breathing

Hollis 212- DC2 Yoke Scuba Diving Regulator


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Feature1Patented Orthodontic Mouthpiece for comfort and reduced jaw fatigue
Feature2Easy grip controls for precise adjustment even while wearing gloves
Feature3Venturi Switch for simple Dive/Pre-Dive modes
Feature4Nitrox compatible to 40%
Feature52 high pressure ports & 4 low pressure ports

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