Danco 10718 Perfect Seal Perfect seal guarantees a perfect seal on the first toilet installation Unlike wax rings, perfect seal is 3 times stronger and allows the toilet to be repositioned as needed Maintains a tight seal when common toilet and floor movement occurs Accommodates flange heights from 1/2 in. above the floor to 1-1/2 in. below the floor Repositionable with no mess and three times stronger than a wax ring