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 210/H-O2 100% Oxygen Service Certified Regulator H-O2 1st Stage 210 2nd Stage


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Feature1Hollis 210/H-O2 100% Oxygen Service Certified Regulator
Feature2Cleaned and assembled in a clean room environment with specially designed materials
Feature3Comes standard with 300 BAR/4500 PSI DIN connection and 40" in. /101 cm regulator hose
Feature4Aluminum Ring optional
Feature5House Of Scuba Is A Hollis Authorized Dealer!

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