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On my Cougar, they included a valve that would select whether the feed for the pump was the fresh water tank or a length of hose that could be inserted into a jug of RV antifreeze. If you can't access the pump, maybe they did you the favor of providing something similar nearby?
If I blow out the lines with air first through the city water inlet, I can winterize the pipes with a single gallon of RV antifreeze, although I usually make it two just to make sure a good amount makes it into the holding tanks to prevent freezing should there be any water down there.
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