This innovative device allows anyone to winterize their I/O engine both easily and inexpensively an individual can winterize their boat without removing those hard to reach engine block drain plugs and without pulling off cooling system hoses. Just let the boat engine do all the work! To winterize simply: (1) slip the unit onto the stern drive over the intakes, (2) attach the tubing to the cooling exhaust holes, (3) use a garden hose to supply fresh water to the reservoir, (4) start your engine, (5) let the engine run to flush out dirty water and open the thermostat, (6) place the tube ends in the reservoir to recirculation, (7) add antifreeze to the reservoir until a safe level of antifreeze and water is obtained, (8) turn off engine and remove the winterizer. For Mercruiser Alpha Stern Drives.

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