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Old 05-24-2020, 04:46 PM   #21
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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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Old 05-24-2020, 04:53 PM   #22
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 16,974
THOR #8860
Keeping the top vent closed, and closing off the sink drain:
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