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Old 05-24-2020, 04:46 PM   #21
Brand: Thor Motor Coach
Model: Quantrum RC25
State: California
Posts: 43
THOR #14016
Our bathroom sink waste drain is connected to the black tank. I found while traveling on rough roads that the p-trap below the bathroom sink becomes empty allowing gases to escape from the black tank into the bathroom. I now travel with the bathroom ceiling vent closed and the sink drain cover in place and closed.
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