The Key Free Hose Deck Fills feature a cap which covers mounting holes for a clean appearance. 1-1/2” hose deck fill cap diameter 3-1/4", thread pitch 11-1/2 NPSM straight. 2” hose deck fill cap diameter 3-11/16", 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.