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The black and grey tanks share the same dump plumbing. It is not unusual to have residual black stuff in the plumbing unless you raise the front of the RV a bunch when dumping. That is why an external gate valve is highly recommended.
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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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