Specialty Gas Regulator, Regulator Supply Type Cylinder, Gas Service Oxygen, Stages Single Stage, Inlet Connection CGA-540, Outlet Connection 1/4 in Tube Fitting, Delivery Pressure Range 0 to 125 psi, Gauge Size 2 in, Supply Pressure Gauge 4, 000 psi, Max. Inlet Pressure 3, 000 psi, Body Material Chrome Plated Brass, Diaphragm Material 316L Stainless Steel, Body Dia. 2.0 in, Includes Diaphragm Type Shut Off Valve and Relief Valve, Standards CGA E-4, Regulator Application Laboratory