Check Valve, Male, Inlet (In. ) M5, Outlet (In. ) M5, Nickel Brass, Max. Pressure (PSI) 116 psi, Cracking Pressure (PSI) 3 psi, Hex Size (In. ) 9/16 in, Max. Temp. (F) 176 Degrees F, Horizontal Mounting, Length (In. ) 1 1/4 in, Steel Spring Material, NBR Seal, Air Compressor