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I blow out all the lines until they're dry, no moisture in the line whatsoever. I also blow the flush line out, then drain the tanks. My water pump is easy to get to, so I just unhook the connections, put a dry towel under the outlet and run it for a couple seconds. dump a pint of RV anti-freeze down each drain, including the toilet. I live in an area where the temperature can get well below zero F. I've been doing this for years. No problems.
Of course every RV is different.
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