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Install New Flapper — Clean the Flush Valve Seat

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How to Replace a Toilet Flapper to Fix a Running or Weak Flushing Toilet · Step 3 of 6

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Take the new flapper and position it over the drain opening. Connect the ears of the flapper onto the pegs at the base of the overflow tube, ensuring it sits securely. Attach the new lift chain to the flush lever arm. Adjust the chain so there is only a small amount of slack (about 1/2 inch) when the flapper is closed to ensure it can lift fully when flushed but also close completely.

Goal: Seat the New Flapper and Connect the Chain

  • Make sure the new flapper sits well over the drain to create a proper seal.
  • Adjust the chain to the appropriate length. Too much slack and it won't lift properly; too little and it won't seal.
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Korky Toilet Repair

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FAQs

What are the essential tools and materials I'll need for this flapper replacement?

Beyond the correctly sized flapper (like a Korky 2-inch or TOTO 3-inch), you'll need cleaning supplies. An E-Cloth Microfiber cloth, A-MAZ The Gripper Scrub Pad, a sponge, and water are useful for thoroughly cleaning the flush valve seat. Always have a towel handy for drips or spills.

How difficult is replacing a toilet flapper, and how long does it typically take for a beginner?

This is a beginner-level DIY project, often taking only 15-30 minutes from start to finish. The most challenging part is usually ensuring a good seal and proper chain adjustment, but with clear instructions, it's quite straightforward and can save you a plumber's fee.

My toilet is still running after replacing the flapper. What should I check?

First, ensure the new flapper is sitting flush on the flush valve seat and isn't obstructed by the chain. Clean the flush valve seat thoroughly again, as mineral deposits or grime can prevent a proper seal. If the problem persists, the fill valve might also need adjustment or replacement.

How do I know if I need a 2-inch or 3-inch flapper, and does it matter for my toilet?

The flapper size depends on your toilet's flush valve opening. Most older toilets use a 2-inch flapper, while newer, high-efficiency models often use a 3-inch flapper. It's crucial to get the correct size; you can measure the old flapper or the flush valve opening, or check your toilet's make and model number.

Install New Flapper — How to Replace a Toilet Flapper to Fix a Running or Weak Flushing Toilet (Step 3, Video 2) | Stesso