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Install New Flapper — Replace the Flapper

Beginner2 hours

Part of project

Fix Toilet Flush & Refill: Valve & Flapper Guide · Step 4 of 5

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In this video

Prepare the new blue flapper. If your old flapper did not have a solid ring, use scissors to cut the ring off the new flapper at the marked cut lines. If it did have a ring, leave it intact and slide it over the overflow tube. Otherwise, hook the ears of the new flapper onto the posts at the base of the overflow tube. Attach the flapper chain to the brass arm of the new lever assembly. Choose a hole on the arm that allows for a small amount of slack in the chain when the flapper is closed.

Goal: Install the new flapper and connect it to the lever arm

  • Ensure there is only a small amount of slack in the chain. Too much slack will prevent a proper flush, and too little will cause the flapper to not seal properly.

Used in this video

  • Scissors (Tool Type: Hand Tools, Power Source: Manual) · optional — Cutting the ring off the new flapper if the toilet does not require it.
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FAQs

Is replacing a toilet fill valve and flapper truly a beginner-friendly DIY project, and can I really complete it within the estimated 2 hours?

Yes, this is a very common beginner-level DIY project. The most challenging part is often working in tight spaces. Most DIYers can complete it within 1-2 hours, especially if they have the replacement parts readily available.

Besides an adjustable wrench, are there any other tools or specific materials recommended to make this job easier or prevent issues?

While an adjustable wrench is the primary tool, a utility knife can be helpful for trimming the refill tube to the correct length. A bucket for any residual water and the specified HDX Multi-Purpose Sponge for thoroughly drying the tank are also highly recommended to prevent mess.

What are the most common reasons for leaks after installing a new fill valve or flapper, and how can I prevent them?

Leaks commonly occur from an improperly tightened water supply line connection or a misaligned washer on the new fill valve shank. Ensure all connections are hand-tightened first, then given a quarter to half turn with the adjustable wrench, and verify that the fill valve gasket is seated correctly against the tank bottom.

What crucial safety precautions or preparatory steps should I take beyond just turning off the water supply?

Always turn off the water supply behind the toilet and flush to drain the tank completely before beginning. Use the sponge to remove all remaining water from the tank to prevent spills. It's also a good idea to wear gloves and have adequate lighting to clearly see all connections.

Transcript
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The assembled unit should look as shown. Check your old flapper for the ring that is located between the ears. If the ring is intact, slide the ring over the overflow tube and push the dual flush flapper down to the base. If your old flapper does not have this ring as shown, simply cut the ring for the new dual flush flapper using scissors on the cut lines as marked on the flapper. Hook the ears of the flapper onto the hooks at the bottom of the overflow tube. When attaching the flapper chain to the brass arm of the tank lever, choose the hole that will allow the chain to have just a small amount of slack. If necessary, remove the hook from the flapper chain and move a few links down to achieve the optimal chain slack. The air tube is used to control the speed at which the

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