Replacing a fill valve is a relatively simple plumbing repair that can be completed in a few minutes. A fill valve is a device that controls the flow of water into a toilet tank. When the water level in the tank drops, the fill valve opens to allow water to flow in. When the water level reaches the desired level, the fill valve closes to stop the flow of water.
There are many reasons why a fill valve may need to be replaced. Some of the most common reasons include: