These Hose Deck Fills feature a slotted cap which requires a key to open and close for extra security. 1-1/2” hose deck fill cap diameter 1-7/8", thread pitch 11-1/2 NPSM straight. 2" hose deck fill cap diameter 2-1/8", thread pitch 11-1/2 NPSM straight. All fills and replacement caps (except waste) include attachment chain. Constructed of corrosion resistant investment cast 316 stainless steel. Installs with three #10 FH fasteners (not included). USCG regulations require bonding wire to prevent sparking.