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
FLATHEAD-LT FIRST STAGE SPECS Balanced. 5 LP Ports. 2 HP Ports. Lighter weight. Z SECOND STAGE FEATURES Downstream valve. Balanced Diaphragm. Dive/Pre Dive Venturi Control. Diver Adjustable Breathing Sensitivity. New Compact Profile. Hose Length 30 in. (.76 m). The wide-open internal structure allows for direct and unrestricted airflow through the 1st stage, giving very low breathing resistance, even at great depths and high demands. It is very low in profile, barely extending above the tank valve, and places the low pressure hoses directly out to the sides, in a pattern preferred by many divers. Zeagles conical precision high-pressure valve provides much greater reliability and service life compared to conventional designs, while improving responsiveness and performance at all breathing rates. Its unique construction brings the weight down to two and a half pounds, Zeagles lightest regulator yet.
Z SECOND STAGE FEATURES Downstream valve, Balanced Diaphragm, Dive/Pre Dive Venturi Control, Diver Adjustable Breathing Sensitivity
FLATHEAD-LT FIRST STAGE SPECS Balanced, 5 LP Ports, 2 HP Ports, Lighter weight