Winterize your inboard/outboard marine engines right on the trailer. This do-it-yourself kit makes it quick and easy to flush and prepare your engine for winter storage. This gravity flow system includes a 5-gal. antifreeze tank with on/off valve, a ball valve, winterizing tee, and 8' clear hose with fittings. All you need to add is your flusher and antifreeze (not included). Saves time and money | Do-It-Yourself Boat Winterizer