Post subject: How do I fix a black tank leak?

bob b wrote:
There is seepage at the top of my black tank right where the toilet drain hooks to the tank. It leaks from the bottom side of the flange where it meets the top of the tank. I have some ideas but am not sure of the best path. thanks in advance, Bob

Yikes.

Have heard of people cutting open the floor to access the joint to remove the old pipes and doing a better job of plastic welding. Depends on how much you want to do of course and how talented you are with construction.

If you can reach the outside of the joint from topside or below, there are clamp on rubber devices to stop leaks. Check at Home Depot and the like. If there's no room, you might have to put an interior sleeve inside the drain...assuming there aren't too many bends and such.

Whatever you end up doing, let us know what you came up with.