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woodtrucker's avatar
woodtrucker
Explorer
Sep 28, 2018

RV black tank outlet plumbing

After 4 years of ownership and many happy miles pulling the 5, I've spring a leak in the worst place. sewer...
I think it happened over winter when I forgot to drain black tank completely and it cracked a pipe. Looks like the crack runs the full length of this section. see attached.
I also noticed a U shape crack about 1/4" out from the flange OD of outlet flange exit of black tank. It was repaired with caulk in the past and I think I'm gonna clean it up and to some fiberglass/epoxy resin to seal that back up right.

As for the exit pipe between second elbow and valve, it's a about a long crack. Could I repair the same way possibly or would that kind of length be too risky to repair with fiberglass/epoxy trick?

Any other suggestions beside replacing everything?
link below to a pic
https://ibb.co/eahWe9

15 Replies

  • If you can get it dry first, and it might help to lift one side or one end to do it, then apply epoxy and wrap all the way around the pipe over the epoxy to hold it there. The trick is to apply sealant, then securely wrap all the way around and well past the crack on a dry and sanded surface.
  • Yes it's ABS, you can use ABS or PVC same nominal dimension. PVC to ABS the glues sea foam green.
  • Just ABS and that's it?
    I think I actually have some of that when I patched my dash on my old 02 cummins that cracks dashes all the time.