12V or 24V OIL CHANGER SYSTEM Now there is no need to worry about top heavy packaging or spills from openings on the container. Eliminate those costly yard service fees with the new Jabsco Flat Tank Oil Changer. This 3.5 gallon compact self-contained unit has a self-priming diaphragm pump with an easy pour spout for emptying. This new design allows the unit to be stowed easily in deck boxes, boat storage lockers or RV storage compartments. The unit comes with a dipstick suction tube, battery clamp leads and an on-off switch to make the pumping process simpler and easier