Hi! We have a 2022 cougar half ton 32bhs. Having trouble 1st time emptied grey because water standing in tub and sink. Grey still says full and water still won't drain after emptied water. Any help is appreciated!
Sounds like the path is blocked. Be careful as sometimes RV manufacturers use a "Duck bill" type drain where it's a rubber tube that comes together so if you put something down it and pull back out the path it could damage the setup designed to block odors.
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