I made one, it's easy. Took the in side fitting off the pump. Disconnected the hose from it, it had a water hose clamp holding it on. Went to Home Depot and picked up 2-3 feet of the same size hose, used the same water hose clamp to connect it to the fitting, put the fitting back on the pump, put the other end in the gallon jug of antifreeze, turned on the water pump and winterized.
When done, removed my 2-3 ft. hose and reconnected the the trailer hose.
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