The toilet float is a device that allows water to fill the tank without overflowing. You may have heard it referred to as the ballcock or float valve. … Once it rises to a pre-set level, the mechanism forces the lever to slow the valve, and the water supply is shut down.

What is the float called in a toilet?

A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow.

Does every toilet have a float?

Some toilets don’t have floating balls. If you have not looked inside a toilet tank in some years and are accustomed to the traditional ballcock valves that use a float ball to regulate the tank’s water level, you may get a bit of a surprise when you remove the lid from tanks of more modern toilets.