Check Valve, In Tank, Inlet (In.) 1/2 in Inverted Flare, Outlet (In.) 1/2 in MNPT, Brass, Max. Pressure (PSI) 500 psi, Cracking Pressure (PSI) 1 psi, Hex Size (In.) 7/8 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 This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. -