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Old 11-02-2013, 09:34 AM   #4
DQDick
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Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
You are describing what in our rig is the backflow preventer on the black tank flush. We removed it and use an exterior backflow preventer. Even though you're not putting water thru there currently, if you have in the recent past the water caught in the downhill portion could still provide a drip for a period of time.
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