Fernco Inc.'s wax-free toilet seals (FTS-3, FTS-4) allow easy installation of commercial closet wall carriers, eliminating messy wax rings, foam and felt products. Made of PVC material, the one-piece seals eliminate mold problems and are gas- and water-tight and leak-proof. Company says the seal will not break if the toilet ever becomes backed up. The FTS-4 (shown) connects the toilet to 4"