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Last Updated on November 28, 2022 by acechapman

The fill valve is without a doubt one of the most critical components of a toilet. It regulates the flow of water into the tank. Additionally, it restarts the filling process when the tank is empty. It also prevents water from leaking into the tank if it reaches a certain level. A toilet fill valve is more than just a valve. It’s also a safety device. You’re here to learn how your toilet fill valve works. We’ll be showing you all the available toilet fill valve types.

Many people don’t know that there are many types of toilet fill valves. Some are more complicated than others. They all use different mechanisms to regulate water flow, even though they follow the same principles.

toilet fill valve types

Different Toilet Fill Valve Types

Ballcock Fill Valve

These valves are also known as piston fill or plunger valves, and they are the most popular. They are usually made from metal. These valves have a straight tube that releases water and a plunger stem that is actuated with a floating ball.

The floating ball opens the valve when the tank is empty. When the water level reaches its maximum, the floating ball raises and closes the valve. These valves work better for older toilet models where the water supply is at the tank’s base.

Ballcock fill valves, although still very common on the market today, are not compliant with modern plumbing codes.

Fill Valve for Float-Cups

Float cup valves were invented in the 1950s. These devices are made from a floating cup and not a floating ball attached to a metal arm. The water level changes while the cup moves along a straight tube. The floating cup is connected to a metal spring and an actuating rod.

The spring length can be adjusted to adjust the tank’s maximum water level. This fill valve is extremely popular and is a great low-cost alternative to obsolete ballcock valves.

Some models let you adjust the length of the tube to fit different sizes of tanks.

Floatless Fill Valve

Floatless filling valves do not require a floating ball for operation. These valves were created in the 1990s as an alternative to low-flow toilets. The pressure-sensitive diaphragm is used in floating fill valves. The valve will close when the pressure reaches its maximum point.

They are usually made from plastic and are very affordable. They are very reliable and affordable so floatless fill valves are a popular choice. These devices, like ballcock fill valves, are attached to the tank’s base.

Metal Diaphragm Fill Valve

Fill valves are made of metal diaphragms that are very similar to piston valves. However, they’re anti-siphon. These devices are not actuated by a plunger stem but instead use a floating ball-actuated diaphragm.

Cast brass fill valves tend to rust. This causes the metal arm to become stuck and the floating ball to remain in the same place.

Plastic Diaphragm Fill Valve

These valves are not made from cast brass but instead of being made of PVC. PVC is strong and resistant to moisture. It doesn’t rust as well as metal fill valves. You won’t need to worry about floating balls from rust. These are standard in popular toilet repair kits. PVC can weaken when it is exposed to chlorinated waters.

The valve’s plastic body will crack from excessive water pressure if it isn’t thick enough.

What is the best time to replace the toilet fill valve?

The service life of toilet fill valves is limited. The valve’s ability to stop water flow is reduced over time. Some parts can also wear out and become damaged. You should be especially careful when filling a tankless toilet. There are usually warning signs that indicate when the valve needs to be replaced. Here are some examples:

  • A snarling sound that gets louder over time.
  • Continuous water flows in the tank.
  • Despite numerous adjustments, you can’t solve the problem.
toilet fill valve types

Frequently Asked Questions About Fill Valves

Are all toilet fill valves the same?

No. There are at most five types of toilet fill valves, each with a different mechanism to regulate the water flow within the tank.

Which is the best fill valve for a toilet?

It all depends on what size toilet you have. The most efficient fill valves, however, are floatless because they reduce water consumption per flush.

What is the working principle of a toilet filling valve?

These devices usually use a pivoting switch, which opens or closes the valve depending on the tank’s water level.

How much does it cost to replace a toilet filler valve?

The average cost to replace a toilet fill valve in a bathroom is $275.

Is it practical to replace a fill valve?

Yes. Your fill valve should be replaced as soon as you see any signs of damage or wear out.


You can see that not all toilet fill valve types are the same. Not all toilet fill valves are compatible with every type of toilet. Be careful when you purchase a new filler valve. You should choose the best model for your toilet tank.

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