It's hard to get an idea of size in pictures but if those are 1/2 inch PEX, I would assume those are hot and cold (red/blue) drain lines! That would likely mean the valve is immediately above that point.
The valves are often just above the floor but inside as a way to cut off the water while still inside for better freeze protection.
Possibly in a cabinet and possible it is behind a cover of some sort that is screwed on??
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!
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