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Glenn, they drain the whole water line system. They're the lowest point in the line system. That excludes the fresh water tank itself which has its own drain, as noted. (Just in case you sometime need this info! - Last time we were in Florida (Panama City Beach) they had record lows and we had a couple of nights down to 17 degrees!. We didn't winterize since we were living in it but... who knows, someday you might need this info!)
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