The seat disk predates the Korky flapper, so your toilet must be really old if it has a flush valve that uses one. It’s a flat rubber disk that fits over the valve opening, held in place by water ...

Toilets designed to save water are actually wasting it at an alarming rate, says the U.K.'s largest water utility. Dual-flush toilets have separate buttons for heavy or light flushes with the goal of ...