On your grey tanks you have one for the shower and another for the galley and they fill and drain separately. In addition, if you have a washer the water will go into one or the other or straight to the sewer outlet depending on how they plumbed it and I've never heard of a good way to know other than trying it. On your black tanks, I'm guessing you have two toilets because the single toilet units only have one. Many times in the past the second toilet black tank has a valve handle other than in the convenience center similar to what they do with the galley tanks.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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