Check Valve, In Line, Inlet (In.) 1/2 in (F)NPT, Outlet (In.) 1/2 in (F)NPT, Cast Brass, Max. Pressure (PSI) 250 psi, Cracking Pressure (PSI) 0.1 psi, Hex Size (In.) 1 1/4 in, Flow Range Free Air (CFM) 0 to 38 cfm, Max. Temp. (F) 450 Degrees F, Vertical or Horizontal Mounting, Tap Size 1/8 in for Pressure Switch Unloader Connection, Length (In.) 2 1/2 in, Stainless Steel Spring Material, Disc Positive Seating Fluoropolymer, for Maximum Air Flow, Flouropolymer Poppet, In-Line Check Valve WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)