Replacing a toilet flange is a complicated task and it requires some basic plumbing skills. Follow the below-mentioned steps to replace your toilet flange correctly:
Cut the old flange off correctly and any other obstruction that you may find.
Around the drain opening, you will find the old wax ring, scrape it off and dispose of it.
Pick a new toilet flange to replace
Now place the T-bolts in your new toilet flange
Now, press the toilet flange in the drain opening by using the T-bolts as reference points for positioning.
After that, use a hammer drill to drill holes into the concrete.
Finally, screw the toilet flange onto the concrete.