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I have never tried to force antifreeze into or out of the City Water Connection. I've been winterizing it since 2009 in some pretty cold Nebraska winters and have never had an issue. Nock on wood. And I have never tried to run any antifreeze into the auto fill. i always drain the fresh water tank and open the low point drains till dry then close them up and pump antifreeze wherever the Winterize knob pumps it.
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