Repair Flapper Valve "Two Inch", with Silicone Seal. Designed to Replace Faulty Flapper and Reseal to Stop All Leaks. By Nuflush Seal ring is silicone, Bottom of ring is glued in with gasket seal. Seals perfect because ther made to fit together. Create new flapper seal with caulking ring. Hi-tec flapper change. Change flapper seal without taking toilet apart.