Quick, easy and clean way to change marine lower unit gear lube. Fits standard quart plastic bottles (27400). Flexible hose gets to hard-to-reach fill plugs. Metal threaded fitting fits Mercruiser, OMC, Evinrude, Johnson, Honda (70hp & up), Volvo, Force, Mercury (US origin models) and Gamefisher lower units (check owner's manual to confirm exact size needed). Use adapter for other engines.