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
This premiere travel regulator packs maximum performance into minimum space. A true featherweight second stage, the XS Compact is built from lightweight techno-polymers to eliminate jaw fatigue. Easy to pack and easy to dive, the XS Compact includes dive/pre-dive Venturi switch for managing freeflow and maximizing performance at depth.