I have 2" cast iron pipe that is for kitchen waste. I had to cut out a 32" section of the pipe under the concrete slab of the basement because a wye had failed.
I have replaced the cast iron pipe with ABS and used American Valve couplings to connect the ABS to cast iron.
The only problem is the cast iron pipe is not smooth on the surface. After almost 50 years of being under the basement slab it has "junk" and rock pieces adhered to its surface. I have tried to smooth the surface of the pipe but I can't get it 100% smooth.
So the coupling cannot seal perfectly. I still get a little leak around one of the couplings.
Would anyone have any suggestions as how to stop the leak?