On my 5th wheel they do not have valves, just caps. Planning on adding valves as a mod someday.
Mine are in an odd place. They are under the bathroom, on the CURB side, near the entrance door. Nowhere near water pump or water heater. Gave up looking for them and later found them by accident.
They look like the picture posted above. Keep looking, you'll find them sooner or later.
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2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios