These Hose Deck Fills with Keyless Caps have a built-in key for easy cap removal. The key can be locked in the upright position to open or close the fill and then recessed into the cap for a flush surface. Cap diameter 1-7/8", thread pitch 12 NPSM straight. Caps are color-coded for easy deck fill identification, eliminating dangerous and potentially costly problems caused by misidentification. All fills and replacement caps (except waste) include attachment chain. Constructed of corrosion resistant investment cast 316 stainless steel with molded fiberglass filled nylon cap. Installs with three #10 FH fasteners (not included). USCG regulations require bonding wire to prevent sparking. Gasket sold separately (351349).