I have the same problem too.
Tried go get a check valve at Camping World. They thought I was nuts. They said to go to a hardware store to get one.
Camping world sure isn't what it used to be. They just don't have the repair parts that they used to carry.
I got one on Ebay last year for my black tank flush.
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Huck & Dodie
2005 RE3 MS #2163
2006 F-350 CC 4X4
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