Originally Posted by GMCdiesel
Also how do you remove old flange?I guess it will be glued to black tank.
I got all screws out, but can't pull it out.
If you had the years of experience that a good plumber has, you could chip the hub of the closet flange off of the pipe, but that is a true skill that takes practice.
Your waste pipe may be glued to the tank or it may be pushed through a gasket, but if you're having as hard of a time as it sounds like you are, I'd say its glued in. Can you see where it connects to the tank?