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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A new compact, balanced piston-controlled first stage with exceptional SCUBAPRO breathing performance at a mid-range price. The high airflow delivery to the second stage ensures unaffected breathing effort, no matter the tank pressure or depth. Very good resistance to freezing for a compact first stage, due to the external fins which optimize thermal exchange. Compact in size (16 mm smaller than the MK25) but not in features, this modern, striking first stage has a "smart" hose layout for perfect positioning and easy identification. The standard cap (+/- 20 routing) can be replaced with an optional cap, which has 4-hose low-pressure routing configurations (0/30) and a 5th central High Flow LP port.

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

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