Adapts our 3/8-16 threaded quart, liter and 2-1/2 gallon gearlube pumps for filling the gearcase. Fits Mercury/Mariner 4/5 HP (1987 and newer), 4/5/6 HP 4-stroke, 225 EFI 4-stroke (MY2005 & newer) 8/9.9 HP 4-stroke (MY2006 & newer) 25/30 EFI 4-stroke, all Mercury/Mariner outboards of Japanese origin and all Nissan/ Yamaha/Tohatsu/Honda outboards with an 8 x 1.25 metric threaded gear lube fill hole.