Constructed of corrosion resistant cast 316 stainless steel. Slotted cap requires a key to open and close. All fills and replacement caps (except waste) include attachment chain. Installs with three #10 FH fasteners (not included). USCG regulations require bonding wire to prevent sparking. 1-1/2 hose versions feature 1-1/4″ 11-1/2 NPSM straight cap threads.