Wm Harvey 004375 Reinforced Wax Extender Kit Wm Harvey 004375 Reinforced Wax Extender Kit Features:;Up to 20 times stronger than ordinary wax gaskets;Gasket is guaranteed for 10 years;All mineral, will not rot or leak like fiber, sponge or felt gaskets;Urethane foam core resists puncture by carrier coupling or flange;Will not support bacteria, impervious to vermin;Never hardens or deteriorates, stays flexible and resilient;Holds five times more pressure than un-reinforced wax;Watertight, gas tight seal;Includes a 1/4" x 3-1/2" brass bolt kit;Extender kit has extra thick wax and was especially designed for problem areas where the floor flange is 1/4" to 1" below the floor surface