we just purchased a 2013 Dutchmen Denali 287re. The control panel shows there is 2 gray tanks yet there is no dump valve for a second tank. I decided to let the gray tank 1 fill completely to see if i...
With water in shower, run some in the other sink. If the level in shower does not rise immediately, start at that sink, and listen to drain water flow. Best not to need to find a full tank to use the sink