This pump is perfect for convenient pumping of your Mercury Lower Unit Gear Oil.  It is intended for use with quart or liter bottles and will fit any outboard or stern drive with a 3/8"-16 drain plug.  This pump also comes with a metric adapter that will work for gear cases with a M8 x 1.25 drain plug.  Fits all Mercury, Mariner, Johnson/Evinrude, Suzuki, and Honda outboards.  Fits all Mercury/MerCruiser, OMC Stern Drive, Cobra, and Volvo Penta stern drives. Also fits Speedmaster gear housings.