What is flush valve on toilet?

A flush valve is a self-closing valve designed to release a large volume of water when activated. This mechanism is often used to flush a toilet or urinal. The valve and associated hardware are located within the toilet tank or in the body of the urinal.

How does a flush valve work?

The flush valve uses a flapper, which is controlled by the flush handle and held open by the floating weight. When the toilet is flushed, the handle lifts a chain, which opens the flush valve. Water drains through the valve and into the bowl.

What causes a flush valve to leak?

If the flapper is worn or the seat that the flapper rests on is damaged, the water level will stop just below the flapper. If the gasket that seals the flush valve into the tank is deteriorated and leaking, the water would most likely drain completely out of the tank.

What kind of flush valve do I have?

You can determine whether this is the flush valve or the fill valve by looking at the overflow tube in the toilet. If the water level is overflowing into the tube, then the issue is the fill valve.

How do I know if my flush valve is leaking?

Here is a simple Toilet Dye Test you can complete to see if your toilet is leaking.

  1. Drip 10 to 15 drops of food coloring into the toilet tank. …
  2. Wait 10 minutes.
  3. If colored water appears in the toilet bowl, you have a leak.
  4. Generally the leak is in or around the plunger ball or flapper valve at the bottom of the tank.
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How do I fix a leaky toilet flush valve?


  1. Turn off the Water Supply. …
  2. Remove the Old Flapper or Tank Ball Assembly. …
  3. Remove Remaining Tank Water. …
  4. Clean the Valve Seat. …
  5. Install the Sealant Ring. …
  6. Position the Flapper Assembly. …
  7. Attach the Lift Chain. …
  8. Turn on the Water and Fill the Tank.

How much does a flush valve cost?

Fill, Shut Off & Flush Valves, Flapper

A simple toilet valve replacement typically costs $70 to $150. A complete rebuild of the closet tank which includes the flush handle, flush valve, flapper, ballcock, and tank bolts costs around $275.

When should a flush valve be replaced?

The flush valve assembly also includes the flapper, which seals the opening and holds water in the tank until a flush is initiated. The clearest sign that a flush valve needs to be replaced is when water continues to run, even after the flapper and other possible causes have been addressed.