ZRod

Secret is to take the outer collar off a small chunk at a time. Try to score about a 1” wide chunk, pop it off with a screwdriver and then do another small chunk. If you try to take too much at once you may break the pipe (then u b screwed).

@Cdog923 and I have the same solution

I ended up just buying a flange to fit inside the 3 inch pipe. I don't think I can take a s#!t big enough to clog it anyway. It's got a rubber gasket so I can always go back and replace it the "right way" if it doesn't work out.