When I winterized my previous toy hauler, I was lucky that I only had to use 2 or 3 gallons of RV antifreeze poured into my fresh water tank to winterize. The water pump input was located at the very...
Mine has a T with valves so I can draw from the freshwater tank or from a 3 foot hose that is rolled up in the compartment. I unroll the hose and stick it in the antifreeze and pump it through the system. Then I don't have to worry about antifreeze in the freshwater tank. Works great! Brian
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