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It helps to get correct answers if you supply the year and model of your RV.
The most common causes are a clogged drain screen or a "junked up" HepvO" valve. The HepvO valve replaces a "P" Trap. It is easy to remove and clean. DO NOT run a snake or brush down the drain to clean it! Guaranteed you will then be buying a new one.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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