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 MK21 First Stage Only Regulator


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Feature1New compact piston for 2014
Feature2Close to 20% smaller than our MK25
Feature3Unique thermal exchange design with external fins, optimizing freezing resistance
Feature4Optional replaceable head for optimal positioning with 4 LP routing configurations (0/30) plus a 5th central LP HF port. Ideal for Technical diving.
Feature5Polished chrome plated marine grade brass

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