This was easy to install. My only problem with it is that the interior ring of plastic does not reach clear to the toilet bowl like the outside.  The reason I made this purchase was because of an issue with my husband making a mess with urine escaping between the seat and the toilet rim. I thought the added height would be on the  inside edge as well as the outside and that it would take care of our problem. Unfortunately it did not although I am still pleased with the added height the seat adds to the toilet.