It's hard to tell from the photos I find, but that grey water valve should be an 1˝" Waste Valve. You can replace just the body and not have to redo the plumbing. It has four screws through the body and flanges, that you can remove and the body will slide out between the flanges.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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