How is the 5403 flapper different than 5401 3’ flapper?

The 5401 is a direct replacement for both the Glacier Bay and American Standard models that are equipped with a 540 Flapper and flush system. The 5403 is a universal replacement for most 3 inch flapper and flush systems including Glacier Bay and American Standard. The 5403 comes with on additional adjustment for the hinge, it allows the flapper to attach to wider 3 inch systems that are not Glacier Bay and American Standard.

What is the difference between solid frame and flexible frame flappers? Does one have more advantages than the other?

A solid frame is sturdy and does not allow the flapper ball to twist or mis-align with the drain seat. It center punches the drain every time for a perfect seal. The all flexible flappers are great to use when you have an over sized 2 inch flush valve which does not allow a solid frame to fit (it may stick on the drain and not close). The flexible flapper comes equipped with an overflow pipe adaptor which allows you to connect the flapper to the drain when it does not have mounting pins for a flapper to attach to.

What size flapper do I need?

Fluidmaster manufactures a universal 2” flapper and a universal 3” flapper. To determine the size of flapper you need, measure the drain hole the flapper covers, if the hole is 2.5 inches use a 2 inch flapper and if the drain hole is 3.5 inches use a 3 inch flapper.

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The 5403 - Universal Adjustable 3" Flapper is available online, from our following retail partners.

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5403 - Universal Adjustable 3" Flapper

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Quickly solve common leak and running toilet problems with Fluidmaster®’s 5403 3” Water-Saving Adjustable Flapper. Made for newer 3” flush valve toilets, this model is a fast and simple install. The adjustable flapper arms, and universal design ensure it will quickly fit most 3” flush valve toilets.

Stop a running toilet and optimize your flush with the 5403 Water-Saving Flapper
Universal – Fits most 3” flush valves
Fits American Standard®, Kohler® Cimmaron, Toto® and other toilets
Easy to install
Adjustable dial for flush performance and water savings
Long lasting silicone seal
Chlorine and hard water resistant**
Solid frame for the best seal- no twisting
10 year warranty

Home Improvement Expert, Bob Vila, independently rates the 5403 flapper as the best overall 3-inch flapper for running toilets. Click here to see Bob Vila’s top picks for flappers: Bob Vila’s Best Flapper Replacements

Best for newer toilets, 1.28 & 1.6 GPF (after 1994). Customize your flush and save water with the adjustable dial, simply turn to adjust for more or less depending on your needs. This long lasting flapper also features a durable silicone seal that lasts up to 10x longer than standard designs. Eliminate leaks and save water with quality you can trust, the Fluidmaster® 5403 Universal Adjustable 3” Toilet Flapper.

** DO NOT USE IN-TANK DROP-IN TOILET BOWL CLEANERS CONTAINING BLEACH OR CHLORINE. USE OF SUCH PRODUCTS WILL RESULT IN DAMAGE TO TANK COMPONENTS AND MAY CAUSE FLOODING AND PROPERTY DAMAGE. USE OF SUCH PRODUCTS WILL VOID THIS WARRANTY. Instead, we recommend using Flush ‘n Sparkle® automatic toilet bowl cleaner.

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