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Old 11-03-2015, 09:13 AM   #1
barmar
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Join Date: Apr 2008
Location: Union Bay
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M.O.C. #8385
Winterizing-Black Water Flush Line

Winterizing again but have a question. Once I've confirmed all onboard systems have pink solution in place can I then hook up the outside shower hose line to the black water flush connection and turn on the shower? This would force pink solution into the flush line/back flow preventer making sure the line is free from normal residual water. Seems to me I read about this somewhere.
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Old 11-03-2015, 09:40 AM   #2
BB_TX
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That is what I do.
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Old 11-03-2015, 03:05 PM   #3
dieselguy
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Join Date: Feb 2005
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Or ... if you winterize with air, just screw on the blowout plug to the black tank flush fitting just like you would to the city water fitting and give her a short blast.
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Old 11-04-2015, 05:41 AM   #4
Mark N.
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I just hook up an air chuck/hose bib adapter and give it a quick blast of air to push any water in it into the black tank. There is very little water held in that line.
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