Specialty Gas Regulator, Regulator Supply Type Cylinder, Gas Service Hydrogen, Stages Single Stage, Inlet Connection CGA-350, Outlet Connection 1/4 in Hose Barb, 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 Neoprene, Body Dia. 2.125 in, Includes Outlet Needle Valve and Relief Valve, Standards CGA E-4, Regulator Application Laboratory. This item has been restricted from sale in the following state (s): []