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We just got a 3700PTB and have ran into the same problem. The best I can figure out is that the kitchen sink drains into the rear black tank. Since I am stationary at this time I keep it open and draining into the septic. We have a no using the back toilet policy. This is unfortunate and would...

I am on the way to get my Gateway 3700 PTB. I am vey excited. I am glad I found this board and hope to learn a lot from it.