Spent today rebuilding my Axis' broken plumbing system. Biggest issue was reconnecting the main 3" black water drain pipe to where it separated from dump valve assembly. As the old saying goes, "two heads are better than one". A helpful neighbor looked over my project and suggested separating the black water dump valve from the dump valves assembly. This left just the 3"
connecting collar, which, after sanding both the connecting surfaces of the pipe and collar, I glued together with goodly amount ABS cement. Wish Thor had cemented this joint at the factory. Then wrapped the joint with self-fusing silicone plumbing repair tape, just for good measure. Bolted everything back together...which was easier than I'd expected. My bad back was screaming by the time I finished buttoning it all up, so tomorrow, I'll fill both the black and gray water tanks and do a test dump (with clean water), to be sure all my connections don't leak. Hoping they don't.
Thanks to those who offered advice and suggestions!