After tearing everything apart including the flexible hose and not opening up the plug, we used a plumbing snake, the kind that you can crank and rotate as you insert it. We got one we knew would go all the way to the gray tank, after using it all is well. I think with use, even being careful we had a plug of grease or food at a sharp corner.
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Bill B
2007 Navigator, 45' Series 60
Full-Timing since 2004
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