McDuff
The plumbing diagrams are pretty hard to read, so I can't tell you where to look to see it, but I am nearly 100% sure that on my '03 UA 40e, the commode and bathroom/vanity sink go to the black tank (absolutely sure on those ...wife has failed to completely turn off water in the vanity a couple of times!), and the shower and galley sink go to the gray tank. I guess the best way to test it out would be to open the gray valve, and run water through the galley sink and see if it comes out. In fact, I may try that just to be sure ...I have a transparent elbow in my dump line so I could easily see the results.
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Paul (KE5LXU) ...was fulltimin', now parttimin'
'03 Winnebago UA 40e TRADED OFF JUL 2023 / '17 Jeep Grand Cherokee toad
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