Flapper-Style Flush Valve
This flush valve has been standard on toilets since Korky first introduced it in the 1950s. Designs vary, but most consist of a two-inch drain pipe secured to the bottom of the tank by a plastic lock nut; an overflow riser to prevent overfilling; and a rubber flapper that covers the drain opening.
A chain connected to the flush handle raises the flapper. The force of the water flowing through the valve keeps the flapper up until the tank empties.
The valve itself lasts almost forever, but the flapper eventually wears out and needs to be replaced. Phantom flushing is one of the most common indications you need a new one. However, I’ve found a chain adjustment often fixes flapper leaks, saving money on a replacement.
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