The Danco Perfect Seal guarantees a perfect seal the first time, every time. The toilet can be repositioned as needed and the seal is guaranteed to work with any toilet and any sized drain. Specially designed rubber gaskets with encapsulated wax ring. The seal is 3 times stronger than normal wax rings and provides a no mess installation. The seal fits flange heights 1/2" above and 1-1/2" below the floor.