Although I really can't understand how any water couldbe left in the black tank flush line, should flow both ways out from the high point, I did just go out to my rig and run antifreeze through it, "just in case".
It gets real cold here before I head down to Arizona in January.
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Gary and Sandra
Edmonton, Alberta, Canada
2015 GMC Sierra 2500HD
2018 Montana 3120RL
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