Check Valve, In Tank, Inlet (In.) 3/4 in OD, Outlet (In.) 1 in (M)NPT, Brass, Max. Pressure (PSI) 450 psi, Cracking Pressure (PSI) 0.1 psi, Hex Size (In.) 1 5/16 in, Flow Range Free Air (CFM) 0 to 30 cfm, Max. Temp. (F) 400 Degrees F, Vertical or Horizontal Mounting, Tap Size 1/8 in for Pressure Switch Unloader Connection, Length (In.) 3 7/8 in, Stainless Steel Spring Material, Flouropolymer Poppet, Thread Coating Vibra Seal, In-Tank Check Valve WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)