I have an old toilet flange which was a brass ring on a 4" lead bend that connects to the main cast iron stack. The old brass flange ring corroded and broke. I found a nice PVC fitting that fits snugly inside the old lead bend from Oatey but now I need to find a sealant that will adhere to both the lead and the PVC. Or at least to the PVC.
I was going to use the fitting that has the mechanicaly expanding rubber gasket, but this is too long and hits a radius of the pipe before the flange itself is fully seated to the floor.