Unloader Check Valve 145-175 Pressure Range Inlet (In.) 3/4 in Outlet (In.) 3/4 in Brass Max Pressure (PSI) 250 psi Hex Size (In.) 3/4 in Flow Range Free Air (CFM) 60 cfm Max Temp (F) 500 Degrees F Length (In.) 5 1/2 in Stainless Steel Spring Material 15 Percent Glass Filled Poppet Air