Ceramic disc valve is an innovative water control system found in each faucet. HIMARK faucet uses the import well-known ceramic disc valve. Each time you use one of our faucets, two discs control water flow by gliding back and forth in an airtight seal. The valves are unaffected by temperature extremes, sand, rust or hard water conditions. Extensive life cycle testing assures that each valve will survive more than 300 thousand times uses.