Bought this kit when I re-did my main bathroom... but I had an additional problem, the flange wasn't level or at least parallel to the floor, and after new flooring it was too low. I had tried the two rings previoiusly (pre-remodel) and it eventually leaked, twice. This was an original old cast iron installation. I thought about just redoing it with plastic but time and lack of good access in the crawl space made me think better of it. So, I ground the plastic extension ring with a belt sander to make it parallel with the floor, plenty of silicone sealer and used the jumbo reinforced wax ring someone linked to here (with the tube that goes down into the pipe). So far no leaks and the toilet now sits nice and firm on the floor. Momma's happy so must be doing something right. This post was edited by W_B at 06:16:03 04/17/13.