Perko Gas Fill for 1-1/2" HoseThis Perko gas fill has a chrome plated zinc alloy flange, and a black polymer cap with strap. Included is the grounding screw and cap retainer and gasket.Specifications: For Hose Size: 1-1/2"; O.D. Flange: 3-1/8"; Neck Length: 1-7/8"; Mounting Hole Diameter: 2-1/8"; Screw Size: #6;