Check Valve In Tank Inlet (In.) 5/8 in Inverted Flare Outlet (In.) 3/4 in (M)NPT Brass Max Pressure (PSI) 500 psi Cracking Pressure (PSI) 1 psi Hex Size (In.) 1 3/16 in Flow Range Free Air (CFM) 0 to 30 cfm Max Temp (F) 450 Degrees F In Tank Mounting Length (In.) 2 3/4 in Stainless Steel Spring Material Glass Filled PTFE Poppet Air Compressors