Gas Regulator, Regulator Supply Type Cylinder, Gas Service Oxygen, Stages Single Stage, Inlet Connection CGA-540, Outlet Connection 9/16 In. -18 RH B, Delivery Pressure Range 175 psi, Gauge Size 2 in, Supply Pressure Gauge 4, 000 psi, Max. Inlet Pressure 3, 500 psi, Body Material Brass, Diaphragm Material Stainless Steel, Body Dia. 3.25 in, Includes External Relief Valve, Nickel-Plated Bonnet, Standards UL Listed, Regulator Application General Purpose. This item has been restricted from sale in the following state (s): []