I'm repairing a toilet flang on an 80-year-old home with old cast iron plumbing. What I have is a 4.5 inch inside diameter cast iron hub. A 4 inch ID PVC pipe drops in nice and snug, but I cant figure out a good way to create a seal.
Hub pictured here:
This next picture shows you what the previous owner did. They just droped 4 inch ABS in and put some kind of glue or plumbers putty around the edge. It obviously did not create a good seal.
A few places on line have suggested using a compression donut such as the one below. However, the 4 inch compression donut is too large to fit in the hub and the 3 inch compression donut is too small.
What other options do I have? I am at a loss at this point. Some other suggestions have been a rubber sleeve, but I have not found one that would fit.