What Is a Flapper Valve?
A flapper valve is a rubber or plastic seal inside a toilet tank that controls water flow into the bowl. The valve lifts when you press the flush handle, then drops onto the flush opening. A working flapper valve creates a seal after flushing, while a worn valve can cause running water.
Quick Facts About Flapper Valve
Category
Toilet tank component
Used for
Controlling flush water
Common confusion
Often mistaken for the fill valve
Also called
Toilet Flapper, Tank flapper
Often discussed with
Toilet Repair
Key Takeaways About Flapper Valve
- The flexible seal sits over the tank’s flush opening.
- A worn valve often causes a toilet to run.
- A flapper valve is not the toilet fill valve.
How Flapper Valve Works
A flapper valve hangs over the flush opening at the bottom of a toilet tank. Pressing the handle lifts the valve, so tank water enters the bowl. The valve then settles back onto the opening.
Related glossary terms: Toilet Fill Valve, Siphon, Water Pressure.
The seal must stay flexible and sit evenly. Mineral buildup, wear, or a stretched chain can keep the valve from closing fully. Water then moves slowly from the tank into the bowl, and the toilet fill valve may keep refilling the tank.
Toilet designs use different flapper shapes and chain connections. A replacement must match the flush opening and the tank design. A quick check can include the valve’s seal, hinge points, and chain slack.
Expert Note
When we inspect a toilet, we watch the flapper valve during a full flush and after the tank refills. We check the seal, chain movement, and flush opening for wear or buildup. We also look for a fill valve that runs because the flapper valve does not close fully.
Flapper Valve in Practice: A Real-World Example
A toilet may flush normally but keep making a soft hissing sound afterward. The flapper valve may be allowing water past its seal, so the tank keeps filling.
Related Services
Related Terms
Toilet Fill Valve
A Toilet Fill Valve is a toilet tank component that controls fresh water entering the tank…
Siphon
A siphon is a flow path that moves liquid from a higher level to a lower…
Water Pressure
Water pressure is the force that moves water through supply pipes and plumbing fixtures. Pressure helps…
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