Constructed with chrome plated die cast zinc. Cap features easy-to-use tabs for keyless operation. Includes attachment chain. Cap threads are 1" - 12 NPSM straight. Installs with three #10 FH fasteners (not included). Fits 1-1/2" ID hose. USCG regulations require bonding wire to prevent sparking. Type Gas Hose 1-1/2" Flange 3-1/8"