Waste coming out when opening flush top
2 weeks in a row now after dumping the black, gray and then 2nd gray tank the weekend prior when we show up at the next campground a week later and I open the lid to the dump I am getting black tank ...
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Sounds as though you are dumping & not getting everything out. Try flushing the tank afterwards with a wand & repeat if needed, & yes the valve is not sealing properly.
