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 50 psi Gauge Size 2 In. Supply Pressure Gauge 4000 psi Max Inlet Pressure 3000 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