I found this online. I cannot believe this is put together like this. I have tried and tried and it still drips. The way the pipes all connect I cannot even pull the pipe out of the flange, clamp loose it will wiggle and that is it. Only thing I can do is cut pipe (would have to go together with a slipe fitting with rubber seals). If I take shut off valve apart that would give 1/2 inch of room and not sure if that is enough to pull pipe out, clean and try again.
Great question Roger! You’ll see that set-up often, the clamp (and sealant), whenever the holding tank is made out of HDPE; high-density polyethylene. All waste plumbing including the outlet pipe is made of ABS. Unfortunately, you cannot cement, bond or weld dissimilar thermoplastics. The actual outlet fitting on an HDPE tank is tapered a little and some technicians could not understand that the tighter you tightened the clamp, the more it tried to squeeze the ABS pipe out of the hole. It is necessary to cut the ABS outlet pipe to just the right length so that it wouldn’t slip out and such that it would not protrude too far into the tank outlet, trapping debris under the outer circumference of the pipe sticking inside the tank. It wasn’t necessarily a great design but when coupled in tandem to the other tank outlet via the whole termination assembly, it sufficed. Today you’ll mostly see spun-on or welded threaded fittings to make that connection. Pictured here is the sealant I use. Just slop it on the outside of the pipe and tighten the clamp just enough to keep it from leaking. It sill might be possible to manually rotate the pipe in the tank outlet, but once you reconnect the entire waste manifold, all will stay in place.
