Flat Tank Oil Changer System - 3.5 Gallon Tank - 12V The Flat Tank Oil Changer System simplifies the engine oil changing process, ideal for changing engine oil in Boats, RV's, Lawn and Garden Equipment. There is no need to worry about open containers causing spills when changing engine oils with the 3.5 Gallon (13LTR) compact self-contained unit fitted with a self-priming diaphragm pump with an easy pour spout for emptying. The Flat Tank design allows for easy storage in deck boxes, boat storage lockers, or RV storage compartments. Easy to use, clean and efficient dipstick suction tube, battery clamp wire leads, an on-off pump switch. Features Stores easily Compact robust tank design Easy pour spout with screw on cap Easy to carry handle 3.5 gal. sealed container Self-priming, run dry pump Volts - 12 V