Discharge Valve, Inlet Size 1/2 in, Inlet Type NPT, Inlet Gender Female, Outlet Size 1/2 in, Outlet Type NPT, Outlet Gender Female, Exhaust Size 1/2 in, Exhaust Type NPT, Exhaust Gender Female, Maximum Operating Pressure 250 psi, Maximum Air Flow 4 cfm, Body Material Aluminum, Spring Material Stainless Steel