Fill Valve Vs Flush Valve

Fill and flush valves are essential components of a toilet. Understanding the differences between them can help when deciding which one to fix or replace. This article discusses their differences and how they work.

The Toilet Tank contains both a Fill Valve and a Flush Valve

Fill Valve

A fill valve, also known as a ballcock or float valve, is a device used in a toilet tank to regulate the flow of water from the main water supply. It is responsible for maintaining the correct water level inside the tank so the toilet can flush adequately. 

The filling valve has a float that rises and falls with the tank’s water level and a valve that opens and closes to control the flow of water into the tank. It is typically located behind the toilet tank and is attached to the main water supply by a water line.

Flush Valve

The flush valve is a component of the toilet tank that controls the flow of water from the tank to the bowl when flushing the toilet. It is typically located within the tank and is connected to the bowl via a flange and seal. 

This valve includes a lever or button that, while the valve opens, allows water to flow from the tank to the bowl. Additionally, a flapper or seal is included to open and close, allowing water to be released from the tank and prevent it from entering the tank. The size, shape and materials of the flush valve may vary according to the type and brand of toilet.

The Distinction Between a Fill Valve and a Flush Valve

The fill valve and flush valve are distinct elements of a toilet. To help you better understand the distinction between the two, here are some of their disparities:


The fill valve is located inside the tank and connected to the water line from the outside. The flush valve is inside the tank but works downward with the tank body.

Connect With

While the flush valve is connected to the bowl, the fill valve is connected to the water line.

Main Function

The primary function of a fill valve is to refill the tank with water after the flush valve has emptied it. A flush valve’s primary function is controlling the water released from the tank into the bowl when the toilet is flushed. 


Fill valves typically cost less than flush valves. Fill valves range in price from approximately $10 to $30, while flush valves usually cost between $20 and $320. 

What Type of Maintenance is Required for a Fill Valve or Flush Valve?

Regular maintenance of the fill and flush valves is recommended to prevent calcium and mineral buildup or dirt accumulation. Toilet tank cleaners should be used weekly, and the valves should be scrubbed with a toothbrush.

Very Dirty Toilet Tank cleaning

Household cleaners such as bleach or glycerin can also be used. Aside from regular cleaning, the valves do not require any additional maintenance.


Share this article with your friends if you found it helpful in understanding the differences between fill and flush valves! Don’t forget to comment and let us know if you have any questions or need more information.

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