A toilet fill valve, also known as a ballcock, refill valve, or flush valve, is a device used to control the flow of water into a toilet tank after it has been flushed. When the water level in the tank drops below a certain point, the fill valve opens to allow water to flow in. Once the water level reaches the desired level, the fill valve closes to stop the flow of water.
Toilet fill valves are an important part of a toilet’s operation. If the fill valve is not working properly, the toilet may not fill with enough water, which can lead to problems with flushing. The fill valve is also responsible for preventing the toilet from overfilling, which can lead to water damage.