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Grey tanks

We have two grey tanks. One is full the other empty.

Sinks-tub won't drain. How do I switch over from full tank to the empty one?

1 answer
According to the Dutchmen owners manual posted at, the wastewater system is self-contained within the RV. There are 2 primary waste systems in a trailer: Black Water Waste and Gray Water Waste. Components are the toilet, holding tanks and termination valves. As in residential households, the drainage system has drain lines, p-traps and plumbing vents that route gases/odours out through the roof assembly.
To get more information about how to switch tanks, please contact the Dutchmen dealer or the company customer care team by phone at (866) 425-**** (toll-free number).
Questions 1