OF A TOILET
The fill valve brings water into the tank after the toilet
is flushed and stays on until the tank refills. Any time water
exits the tank (such as when a flapper is leaking), the fill
valve will turn on in order to maintain the water level.
The flapper sits on the flush valve and is connected to the
tank lever by a chain. When the toilet is flushed, the flapper
lifts up off the flush valve seat and allows the water to
exit the tank.
When the toilet is flushed, water flows from the tank into
the bowl through the flush valve.