Is this your RV?
https://www.rvusa.com/rv-guide/2016-...12rbwe-tr24914
If so I would think the rear black/grey valves are for the bathroom and the one under the slide is for the galley.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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