The 2 valves in the top of the storage compartment are for the washer/dryer prep. In my rig, there are 3 low point drains. one on each side of the curb side storage that have a small hatch held on by screws. There are 2 valves in each. There is another LP drain valve, (single) for the fresh water tank about half way back under the curb side slideout.
Since I am not using my washer, I turned the 2 overhead valves off in the storage compartment and have not notices any thing else without a supply so I am assuming that is the water supply.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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