Replace Toilet Flapper

Replace the worn toilet flapper by shutting off the water, removing the old flapper, installing a matching new one, and testing for a proper seal and flush.

Easy · 15-30 minutes

Tools

  • Rubber gloves
  • Towel or sponge

Materials

  • Replacement toilet flapper

Safety

  • Shut off the toilet water supply before working in the tank.
  • Flush the toilet to empty most of the tank water before removing the old flapper.
  • Use gloves if you want to avoid contact with tank water and buildup.
  • Do not force plastic parts, as they can crack.
  • Turn the water back on slowly and check for leaks after installation.

Steps

  1. Step 1: Shut off the water and empty the tank

    • Turn the shutoff valve near the base of the toilet clockwise until it stops.
    • Flush the toilet and hold the handle down to drain as much water from the tank as possible.
    • Use a towel or sponge to soak up any remaining water around the flapper area if needed.

    Check: The tank water level is low enough to work comfortably. · No new water is entering the tank.

  2. Step 2: Identify and remove the old flapper

    • Look at how the old flapper is attached to the overflow tube and where the chain connects to the flush lever.
    • Unhook the chain from the flush lever arm.
    • Detach the flapper ears or ring from the overflow tube and remove the old flapper.

    Check: The old flapper is fully removed. · You noted the old flapper’s size and attachment style so the replacement matches.

  3. Step 3: Install the new flapper

    • Attach the new flapper to the overflow tube using the same style of connection as the old one.
    • Connect the chain to the flush lever arm.
    • Adjust the chain so it has a little slack when the flapper is closed, but not so much that it can get caught under the flapper.

    Check: The flapper sits flat over the flush valve opening. · The chain is connected securely and moves freely.

  4. Step 4: Turn the water back on and test

    • Turn the shutoff valve counterclockwise slowly to restore water flow.
    • Let the tank fill completely.
    • Flush the toilet several times to confirm the flapper opens, closes, and seals properly.

    Check: The toilet flushes normally. · The flapper seals after each flush and the toilet does not keep running. · There are no leaks around the tank components or supply valve.

  5. Step 5: Make final adjustments if needed

    • If the toilet keeps running, shorten or lengthen the chain slightly so the flapper can fully seat.
    • If the flapper does not align well, remove and reseat it on the overflow tube.
    • Wipe up any spilled water and replace the tank lid carefully.

    Check: The flapper closes fully without sticking. · The tank refills and stops at the normal level.

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bathroom

Replace Toilet Flapper

Easy15-30 minutes

Replace the worn toilet flapper by shutting off the water, removing the old flapper, installing a matching new one, and testing for a proper seal and flush.

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⚡Safety Warning
  • Shut off the toilet water supply before working in the tank.
  • Flush the toilet to empty most of the tank water before removing the old flapper.
  • Use gloves if you want to avoid contact with tank water and buildup.
  • Do not force plastic parts, as they can crack.
  • Turn the water back on slowly and check for leaks after installation.

Tools & Materials

  • Rubber gloves
  • Towel or sponge
  • Replacement toilet flapper

Step-by-Step Instructions

Step 1

Shut off the water and empty the tank

Diagram for step 1: Shut off the water and empty the tank
  • Turn the shutoff valve near the base of the toilet clockwise until it stops.
  • Flush the toilet and hold the handle down to drain as much water from the tank as possible.
  • Use a towel or sponge to soak up any remaining water around the flapper area if needed.
Check

The tank water level is low enough to work comfortably. • No new water is entering the tank.

Was this step clear?
Step 2

Identify and remove the old flapper

Diagram for step 2: Identify and remove the old flapper
  • Look at how the old flapper is attached to the overflow tube and where the chain connects to the flush lever.
  • Unhook the chain from the flush lever arm.
  • Detach the flapper ears or ring from the overflow tube and remove the old flapper.
Check

The old flapper is fully removed. • You noted the old flapper’s size and attachment style so the replacement matches.

Was this step clear?
Step 3

Install the new flapper

Diagram for step 3: Install the new flapper
  • Attach the new flapper to the overflow tube using the same style of connection as the old one.
  • Connect the chain to the flush lever arm.
  • Adjust the chain so it has a little slack when the flapper is closed, but not so much that it can get caught under the flapper.
Check

The flapper sits flat over the flush valve opening. • The chain is connected securely and moves freely.

Was this step clear?
Step 4

Turn the water back on and test

Diagram for step 4: Turn the water back on and test
  • Turn the shutoff valve counterclockwise slowly to restore water flow.
  • Let the tank fill completely.
  • Flush the toilet several times to confirm the flapper opens, closes, and seals properly.
Check

The toilet flushes normally. • The flapper seals after each flush and the toilet does not keep running. • There are no leaks around the tank components or supply valve.

Was this step clear?
Step 5

Make final adjustments if needed

Diagram for step 5: Make final adjustments if needed
  • If the toilet keeps running, shorten or lengthen the chain slightly so the flapper can fully seat.
  • If the flapper does not align well, remove and reseat it on the overflow tube.
  • Wipe up any spilled water and replace the tank lid carefully.
Check

The flapper closes fully without sticking. • The tank refills and stops at the normal level.

Was this step clear?

Common Mistakes

  • ×Buying the wrong flapper size or style for the toilet.
  • ×Leaving the chain too tight, which can prevent the flapper from sealing.
  • ×Leaving the chain too loose, which can let it get trapped under the flapper.
  • ×Forcing the flapper onto the overflow tube and damaging plastic parts.
  • ×Skipping the final flush test and not noticing a slow leak or running toilet.

When to Call a Professional

  • The toilet still runs continuously after adjusting or replacing the flapper.
  • The flush valve seat appears cracked, rough, or damaged.
  • The shutoff valve does not fully stop the water.
  • You find leaks from the tank bolts, supply line, or base of the toilet.
  • The toilet has unusual internal parts and the replacement does not fit correctly.

Notes

  • Bring the old flapper or a photo of it when buying a replacement to help match size and style.
  • Some flappers are adjustable for different flush volumes; follow the package directions if applicable.
  • If mineral buildup is present where the flapper seals, gently clean the surface before installing the new flapper.

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