Put some water in one of them until you get a indication. Then go outside and see which one has liquid in it.
Make appropriate notes on the indicator and valves. I marked mine Bath and Kitchen.
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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