I am replacing a galvanized pipe which has rusted out badly. This pipe connects to another galvanized pipe in the wall which seems to be a vent pipe as well. Where the rusted pipe sat has destroyed the threads in a 3/4" spot, thus causing my new PVC fitting to leak as well. I used plumber's tape to get a good seal but apparently it didn't do the job. What else can I do short of removing a good chunk of my kitchen cabinets and wall the replace this T fitting in the wall?
Cause of the problem.