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

Scubapro MK 11 DIN First Stage Only Scuba Regulator


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MK11 diaphragm first stage has the same structure as MK17 but without a dry chamber and it is the perfect choice for the recreational diver who wants the advantage of a diaphragm first stage for use in temperate waters.

Balanced diaphragm
Chrome plated brass body
Cold water Anti-Freeze protection &amp Dry chamber
Externally adjustable intermediate pressure
Low pressure ports 4 (2 HFP)

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