Fernco FTS-3 3" Wax Free Toilet Seal Designed to seal the toilet to a 3" toilet flange installed on 3" drain pipe. A strong, flexible adhesive creates a positive seal to the bottom of the toilet Size dimension accommodates floors raised above the toilet flange by up to 3/4" Flexible ribs form a tight, positive seal to the inside of the drain pipe NO MORE GUESSING if there is a seal with the bottom of the toilet like with wax rings