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, HB190 Hard Hat Gauge Guard, Nickel-Plated Bonnet, Standards UL Listed, Regulator Application General Purpose. This item has been restricted from sale in the following state (s): []