congrats - you just found the valve that controls the antifreeze inlet! (connects to water pump, and either pulls from fresh water tank, OR antifreeze inlet hose/port).
Note that the city water connection is separate from this, and is isolated from the fresh water tank by a check valve (which is notorious for failing, and allowing pressurized water from the city water connection to backfill your freshwater tank).
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2022 Rockwood Roo 235S
15kBTU AC; 12v fridge; 1kW roof-mounted solar panels; 80 amp MPPT charge controller; 3,500w pure sine wave inverter; 30a automatic transfer switch; MicroAir EasyStart, 600ah Chins LiFePo; Honda EU2200i (with Hutch Mountain propane conversion kit) gathering dust in the storage unit.
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