Regulators, Regulator Supply Type Cylinder, Gas Service Hydrogen, Methane, Stages Two Stage, Inlet Connection CGA 350, Outlet Connection 1/4 in FNPT, Delivery Pressure Range 1 to 22 psi, Gauge Size 1 31/32 in, Supply Pressure Gauge 3,000 psi, Max. Inlet Pressure 3,000 psi, Body Material Nickel Plated Brass, Diaphragm Material Stainless Steel, Body Dia. 1.97 in, Standards ETL & ISO