I can't answer all of your questions but I can say that if you hook up to city water and run that into your black tank flush, you will hear and ultimately see a significant amount of water flowing. I have yet to do this on my current rig but on my previous SOB it sounded like there was a shower in the black tank. That's the reason it is suggested to not flush your black tank unless your black tank dump valve is open.
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2018 Ram 3500 Laramie Longhorn 4X4 Dually Cummins Aisin CC LB / B&W Companion hitch
50 Gallon Transfer Flow in bed tank w/ Trax 3
2018 Montana 3121RL
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