Best OverallKorky 54BP Toilet Tank Flapper
- Item Weight
- 0.09 pounds
- Color
- No Color
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Best Overall
Popular PickA two-in-one fix for a running or slow-filling 2-inch-valve toilet, replacing the fill valve and flapper together instead of guessing which part failed.

A straightforward 3 inch flapper replacement for chlorine tablet users, worth it once you've confirmed the 3 inch opening.

A basic, high-volume 2 inch flapper replacement for a standard tank, best used as a like-for-like swap.

The right replacement only when your toilet's model number falls in Kohler's listed range, since this is a model-matched OEM part rather than a generic fit.

Go with this only after matching your existing flapper's part number against TOTO's compatibility list, since it's built for specific TOTO tanks rather than as a universal 3 inch part.

Correct only for the specific Kohler one-piece models it lists, not a general-purpose 2-inch flapper substitute.

A well reviewed universal 2 inch flapper pack with genuine water-saving adjustment, a sensible default pick before hunting for a brand-specific part.

A straightforward fix for a running 2-inch-valve toilet, with a dial that lets you adjust flush volume instead of settling for whatever the old flapper gave you.

A solid pick for a 3-inch valve toilet with a degraded stock flapper, given the silicone seal's longer rated life over standard rubber.


A targeted fix for a leaking Gerber 99-788 flapper, but confirm the 3 inch opening and attachment arm spacing before buying since it's not a universal part.

A straightforward 3-inch flapper for Gerber 99-788 style tanks. Confirm your valve opening measures 3 inches before ordering.

A genuine Kohler shark-fin flapper for a set list of one-piece toilets. It will not fit other brands or models, so confirm your toilet model first.

A genuine Kohler flapper with chain for a long list of older one-piece toilets. It fits only the listed models, so match your model number first.

A durability-focused 2 inch flapper for households whose water or chlorine tablets chew through standard rubber flappers quickly.

A genuine Kohler flapper for two-piece Class Five toilets across several popular lines. Confirm your tank model, since the part is model-specific.

Two red rubber flappers sized for 2-inch flush valves, worth it once you've confirmed that's your valve size and want a spare in reserve.

A capable 2-inch flapper that lives up to its cross-brand claims once you confirm valve size first. Skip it if you haven't measured.

A simple rubber flapper for fixing a running toilet without tools. Fit claims conflict, so check the flush valve size before buying.


A genuine Kohler flapper for specific one-piece Class Five toilets. Check the tank number inside the tank before buying, since it fits only the listed models.

A 2-pack rubber flapper replacement sized for Gerber 99-788 and other 3-inch flush valve toilets, sold with two spare toilet handle chains for the next repair.

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Korky 54BP Toilet Tank FlapperModel 54BP
Fluidmaster K-400H-039 Fill Valve and Flapper Repair KitModel K-400H-039
Korky 3060BP Large Toilet Flapper 3 InchModel 3060BP
Korky 100BP Ultra High Performance Toilet Flapper 2 InchModel 100BP
Kohler GP85160 Toilet Flapper with Float 2 InchModel GP85160
TOTO THU500S Replacement Flapper 3 InchModel THU500S
KOHLER K-GP84995 Hinge Toilet Flapper 2 InchModel K-GP84995
Fluidmaster 502 Universal Toilet Flapper 3-PackModel 502
Fluidmaster 502P21 PerforMAX Universal Toilet Flapper 2 InchModel 502P21
Fluidmaster 5403 Universal Toilet Flapper 3 InchModel 5403These 10 toilet flappers have the highest ProductDome scores among the established products in this category, meaning ones with a large volume of owner ratings and strong evidence; on a tie, the product with more rating evidence ranks first. The score combines owner satisfaction, rating volume, demand and data quality from public Amazon listings (updated 3 days ago). We do not test products ourselves.
Fluidmaster, Kohler, Korky, Toto, Gerber lead this category among the 12 brands that passed our curation checks.
A listing appears only when it has a recorded price, a minimum customer rating, and enough ratings or monthly sales. Generic and unbranded listings are left out, while every real brand stays, including brands sold only on Amazon. The ones that pass are ordered by the ProductDome score, which weighs owner satisfaction, rating volume, demand and data quality.
Toilet flappers come with fixed or adjustable closing behavior, and with attachment designs that fit different flush valves. An adjustable version lets you tune when the flapper drops, but neither format solves a mismatch with the valve opening or mounting points. Start by identifying the flush valve inside your tank, since a replacement valve fitted during an earlier repair may differ from the toilet’s original equipment.
Fit determines whether the flapper can sit squarely over the drain opening and pivot freely after the handle is released. With the water supply shut off and the tank drained, compare the existing flapper’s attachment arrangement and the valve opening with the replacement’s dimension drawing. Some flappers attach to side pegs; others use a ring around the overflow tube, so follow the replacement’s mounting instructions. Among the 19 products that list item weight, most fall between 0 and 0.3 pounds, and 0.1 pounds is typical.. Use the opening size and mounting geometry to judge compatibility; weight cannot tell you whether the sealing edge will land in the right place.
Next, match closing behavior to the toilet’s flushing requirements. A flapper that drops too soon can interrupt the flush, while one that stays raised too long can release unnecessary water. For an adjustable design, look for instructions that explain how to set it for your toilet, since the setting and tank water level affect the water released. The handle linkage also matters: the chain needs enough slack for the flapper to close fully, yet must lift it clear when the handle moves. Compare the replacement’s chain length and attachment options with your existing lever arrangement.
Before ordering, inspect the valve’s sealing surface for deposits, damage or distortion; a new flapper may not cure leakage caused by a damaged seat. In listings marked Rubber or Plastic, identify the material of the flexible sealing edge, because the label may describe another component. If you use an in-tank cleaning product, read the flapper maker’s care instructions for permitted chemicals, as some treatments can shorten seal life. Confirm whether the chain, hook and any required mounting adapter are supplied or sold separately.
How we list products: every listing here has a recorded price, a minimum customer rating and enough ratings or monthly sales. Generic and unbranded listings are left out; every real brand stays, including brands sold only on Amazon. Products are ordered by the same ProductDome score on every page.Editorial policy