Diesel Biker, I had the same problem, and what fixed it for me was lots of water. When i use the toilet, I fill it to the top of the bowl before I flush, not a problem anymore. Also, my uncle had the same problem with his Jayco 5th wheel, same pipe design. What he did, he cut a section of the pipe in between the 2 45 degree angles, and replaced the section with a removable boot. If he gets clogged, and cant fixe it, he just to the pipe, removes 2 clamps and now has access to both ends of the spectrum, the angel going into the tank, and the angle coming from the toilet.
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