●The oxygen and acetylene regulators reduce the pressure of the gas from the cylinder and regulator the pressure to be delivered to the point of application. ●These regulators are made of forged brass body with zinc aluminum housing cap withstand the most abusive jobsite environments. ●Oxygen Regulator-Inlet pressure range 0-4000 psi, Outlet pressure range: 0-100 psi, Units of measure: KPA and PSI. Acetylene Regulator-Inlet pressure: 0-400 PSI, Outlet pressure: 0-30 PSI, Outlet Thread: 9/16", Hose connector: 1/4 Inch. ●Oxygen regulator-CGA540 inlet connection: suits for most items; acetylene regulators-CGA200 inlet connection: small acetylene regulator fits only small acetylene MC tanks with CGA-200 valve. ●Standard 9/16" - 18 RH&LH outlet hose fitting. 2 in. dual gauges constructed from shatter-resistant polycarbonate lenses for easy reading. And the ergonomic colour-coded adjustment knob for easy adjusting.