
Fluidmaster 5403 Flapper
Score: 92/100
Blissvent Toilet Flapper
Score: 72/100Rankings

The Fluidmaster 5403 is a universal adjustable 3-inch toilet flapper designed for high-efficiency toilets, featuring a durable silicone seal and customizable flush volume settings. It offers a solid frame to prevent twisting and includes an adjustable dial to optimize water usage between 1.28 and 1.6 gallons per flush. It is ideal for quick DIY fixes for ghost flushing, water conservation in homes with hard water or chlorine, and universal replacement in brands like Kohler, Toto, or American Standard.

This is a 2-pack of 3-inch blue rubber toilet flappers designed for high-efficiency toilets, specifically compatible with the Gerber 99-788 model. It features tool-free installation and water-resistant properties suitable for hard water conditions. It is best suited for homeowners with Gerber Viper Toilets needing a water-saving replacement.
| Attribute | ![]() | ![]() |
|---|---|---|
3 inches | 3.625 inchesbest | |
1 count | 2 countbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | ![]() |
|---|---|---|
Material & Durability(2) | ||
Material | Silicone | Rubber |
Seal Type | Silicone | Water Resistant |
Design & Features(2) | ||
Chain Material | Kink-free | Stainless Steel |
Installation Type | DIY | Tool-free |
Packaging & Support(2) | ||
Pack Quantity (count) | 1 count | 2 count |
Certifications | US/Canada Plumbing Codes | |
Compatibility & Fit(4) | ||
Flush Valve Compatibility | Universal | 3 Inch |
Flapper Diameter (inches) | 3 inches | 3.625 inches |
Toilet Type Compatibility | High-efficiency | Gerber 99-788 / HET |
GPF Compatibility | 1.28-1.6 | 1.28 |

Products in the top-left offer the best value (high score, low price).

Professional reviewers, including Home Improvement expert Bob Vila, highly recommend the Fluidmaster 5403 as the best overall 3-inch flapper for fixing running toilets. Experts praise its universal fit, adjustability, and durable silicone construction, noting that it provides quality you can trust for eliminating leaks in newer high-efficiency toilets.
Everyday consumers generally praise the Fluidmaster 5403 for its ease of installation, water savings, and longevity. Users frequently report that it stops running toilets quickly and fits a wide variety of brands. While some users mention a learning curve for adjustments, the overall sentiment is positive, highlighting its reliability and durability compared to standard flappers.




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