Product review

Compatibility and purpose: These replacement flappers are intended for 3-inch large flush valves and are promoted for use with a range of TOTO toilets. They provide a wide sealing surface suited for many large 3" valve housings and are useful for quickly addressing running or leaking tanks. Confirm your model before installing; they are advertised compatible with several TOTO references including ST743S, ST744S, ST754SF, ST764S, ST774S, ST784SF, ST94SF, ST814S, CST756204SF, SCT853S, CST845S and CST874S.

Materials and size: Each flapper is made from flexible, siliconized red rubber and measures approximately 3 inches in diameter. The rubber compound is formulated to withstand municipal water, alkaline hard water and well water, aiming to maintain a reliable seal over time.

What’s included: The package contains eight 3-inch toilet flappers. They are supplied as spare parts so you can replace a leaking unit and keep extras for later use.

Initial odor and handling: A mild rubber smell may be noticeable when you first open the package; this odor typically fades after a short period. If any flappers arrive slightly deformed, gentle warming or reshaping often helps restore form prior to installation.

Installation notes: To install, shut off the toilet’s water supply, flush to drain the tank, remove the old flapper, position the new flapper on the flush valve, attach the chain to the flush lever at a length that allows a full seal but still lifts freely, and restore water. If an old flapper is stuck, cut it away rather than forcing removal to avoid damaging the tank hardware. Some units may require minor adjustments to the chain or gentle reshaping to achieve a reliable seal.

Additional details and cautions: Manual measurements may have small variances. Monitor color differences depending on screen display. Because fit can vary across models, double-check your toilet’s compatibility before ordering and be prepared to tweak positioning for the best seal.

Pros

Made of flexible siliconized red rubber
Includes eight flappers for spares or multiple toilets
Formulated to resist municipal, alkaline and well water

Cons

Some units can arrive warped or misshapen
Fit is not flawless on every TOTO model
Material feels thinner than some name‑brand options

VerdictThis 8-piece 3-inch flapper set offers a low-cost way to stop leaks and keep spare parts on hand. The siliconized red rubber is formulated to resist common water types and delivers a broad sealing surface for 3" valves. However, quality control and fit can be inconsistent — some pieces arrive misshapen or thinner than branded alternatives and may need careful shaping or minor adjustments to seal p

Reviews

dale geimer 1/5

Smaller than other brands

These are too small for my setup; they won’t interchange with the larger cork-style flappers I use.
Adrian 1/5

Warped on arrival — failed to seal

Arrived badly warped and wouldn’t hold water. Complete waste for my toilet — they never formed a proper seal.
JJ 1/5

All five failed

I fitted five of them and every one leaked. They didn’t stop the running — don’t recommend.
Jay 4/5

Good value with mixed quality

Eight pieces fixed my running toilet and installation was quick. They sealed immediately but some felt thinner than brand-name flappers and the fit wasn’t perfect on every model. Slight rubber smell at first that faded after a day or two.
Gordon M. 1/5

Poor packaging and poor fit

They arrived crushed; warming helped, but the pivot holes were too tight so the flapper wouldn’t close. Claimed fit for my TOTO model was incorrect.
Kirst 2/5

Too soft to seal reliably

Material is very soft and some pieces were misshapen enough that they failed to seal.
speakintongue 4/5

Does the job but feels flimsy

Replaced my flapper and kept backups. They work but are thinner than expected; long-term durability is uncertain.
PunkinPie15 5/5

Handy spares, easy swap

Straightforward to install and nice to have extras for future replacements.

Comments

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dale geimer 1/5

Smaller than other brands

These are too small for my setup; they won’t interchange with the larger cork-style flappers I use.

Adrian 1/5

Warped on arrival — failed to seal

Arrived badly warped and wouldn’t hold water. Complete waste for my toilet — they never formed a proper seal.

JJ 1/5

All five failed

I fitted five of them and every one leaked. They didn’t stop the running — don’t recommend.

Jay 4/5

Good value with mixed quality

Eight pieces fixed my running toilet and installation was quick. They sealed immediately but some felt thinner than brand-name flappers and the fit wasn’t perfect on every model. Slight rubber smell at first that faded after a day or two.

Gordon M. 1/5