I have the same coach, Jon. If memory serves correctly, that is the vacuum breaker (aka check valve, back flow preventer, etc.) for the San-T-Flush, which should be below that room in your water bay. It presumably keeps contaminant from the black tank flush operation from getting back into the fresh water source. Such valves have to be positioned a certain distance above the device they serve. You may need to replace the vacuum breaker.
https://swanindustries.com/products/copy-of-pckv101-replacement-plastic-vacuum-breakerI've seen lots of threads about this on RV forums, and here as well as I recall. Some suggest, before replacing the device, that there may be debris fouling the diaphragm, and it might be cleared by removing the two screw atop the valve and inspecting inside. That may entail removing the valve or maneuvering it to where such an endeavor is plausible. That's a lot of "may"s and "might"s, but worth a shot, given the hose clamp methodology used on our era rigs could require special tools. Private Message forthcoming.
I think our breaker is imperfect also, but I never tried a repair before we stopped traveling 8 years ago. So let me know how you make out.
Joel
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