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Old 07-21-2015, 03:57 PM   #2
Javi
Senior Member
 
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,457
Take a look under the sink, a bunch of the trailer have what's called a cheater vent under the sink instead of a vent out the roof. If it backed up to there and the valve is bad it could leak and run down the pipe into the underbelly.
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