My guess is you will have to do some testing and labeling. I would think the two other hose fittings are setup that one fills your fresh tank and one is city water for direct feed to the plumbing with no water pump use. If everything is new, no bathroom usage, I would fill each tank with water and pull the drain. Then check on the monitor panel to see what tank lost level and label the vale pull. Do that for each tank and inlet and you should be all set.
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R.J. and Ginger
2019 Ram 3500 6.7 HO, Aisin Trans 3:73
Reese Goosebox
2019 Sandpiper 379FLOK
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