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- DC1 DIN Technical Scuba Diving Regulator


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Feature1dl dtbu212 Second Stage/b/u/dt dd- Pneumatically balanced second stage/dd dd- Patented Dynamic Adjustment once set automatically maintains inhalation effort throughout the dive by compensating for depth changes./dd dtbuDC1
Feature2Environmental sealing prevents internal corrosion, contaminants, and icing of the first stage
Feature3Designed to withstand the rigorous CE standard for coldwater performance

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