Inlet pressure: 0-4000 PSI, Outlet pressure: 0-200 PSI, Outlet Thread: 9/16", Hose connector: 1/4 Inch. Thread size of oxygen regulator: female nut CGA540（It fits all American Oxygen Tanks with CGA-540 Valve）Inlet pressure: 0-400 PSI, Outlet pressure: 0-30 PSI, Outlet Thread: 9/16", Hose connector: 1/4 Inch. Thread size of acetylene regulator: CGA510 (It will NOT fit small MC or B acetylene tanks)The easy-to-read gauges have large diaphragms to ensure a constant pressure delivery even when there is a change in cylinders or tanks