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 MK17 DIN Balanced First Stage Scuba Regulator The MK17 is a high-performance, balanced-diaphragm first stage engineered especially for cold water or harsh environments. The MK17 is environmentally sealed so neither water nor pollution can enter the inner mechanism. Full-metal (chrome-plated, marine-grade brass) body and components with a dry, ambient pressure chamber prevent it from freezing, ensuring trouble-free operation even in the coldest conditions. DIAPHRAM TECHNOLOGY Diaphragm first stages are the favored choice of cold-water divers because of their better resistance to freezing. With a dry chamber, diaphragm-based first stages are also recommended for those working in water containing a high degree of suspended particles. Diaphragm first stages are also recommended for those working in water containing a high degree of suspended particles, silt, or other contaminating materials. All our diaphragm first stages feature balanced technology and are packed with original features that deliver fast flow to the second stage upon demand and good overall performance.
Chrome plated brass body
Cold water Anti-Freeze protection & Dry chamber