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
The XT Regulator welcomes a new generation of regulator performance at Dive Rite. An elite performer, the XTs advanced, patented design earns top marks from Mike Ward of Dive Lab. With work of breathing at less than 1.0 J/l, the XT performs right alongside premier regulators on the market today.