Best suggestion is to get a short, clear pipe that attaches between your sewer hose and the dump valve. At least you can then figure out which is the black valve. The small pipe should be the galley, but no idea which of the other two is which.
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2010 Cougar 30RKS
2015 GMC Sierra Max Trailer
"Drinks for 6, Dinner for 4, Sleeps 2"
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