Perfect Seal is an innovative new product that takes the guesswork out of toilet installation. Perfect Seal is truly universal and it will work with any toilet installation. It fits any drain size and flange depth. It accommodates flange heights from 1/2 in. above the floor to 1-1/2 in. below the floor and maintains a tight seal when common toilet and floor movement occurs. Depending upon the height of the floor flange and the toilet horn, there may be instances when the toilet may not sit flush to the floor. In these situations, the black plastic ring that is inside the gray rubber casing of the Perfect Seal can be removed. The removal of this hard plastic ring will allow the Perfect Seal to be fully compressed and the toilet should then sit flush with the floor.