Filling differentials, transfer cases, transaxles, outboard lower units and some transmissions can be a messy and frustrating process. Often times, room is limited and one needs to be a contortionist to properly get into place. The AMSOIL Oil Hand Pump is an inexpensive and highly effective little kit that allows you to fill components quickly and cleanly. It fits AMSOIL quart, gallon, and 2.5 gallon bottles. Once you try this unit, hose/funnel contraptions and spillage mishaps will be a thing of the past. We use a clean quart bottle to pump a bit of solvent through the unit after usage and allow everything to dry before storage.