
Fluidmaster PerforMAX Flapper
Score: 88/100
Blissvent Toilet Flapper
Score: 72/100Rankings

The Fluidmaster 502P21 PerforMAX is a universal, adjustable 2-inch toilet flapper designed to resolve weak flushes, running toilets, and water waste in toilets with 1.28, 1.6, or 3.5+ GPF ratings. It features a dial-adjustable mechanism for customizing flush volume, Microban antimicrobial protection, and a solid frame to prevent twisting during operation. It is best suited for homeowners with most 2-inch flush valve toilets experiencing weak flushes, running toilets, double flushes, or high water use.

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 | ![]() | ![]() |
|---|---|---|
2 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 | Rubber/Plastic | Rubber |
Seal Type | Solid Frame | Water Resistant |
Design & Features(2) | ||
Chain Material | Standard | Stainless Steel |
Installation Type | DIY | Tool-free |
Packaging & Support(2) | ||
Pack Quantity (count) | 1 count | 2 count |
Certifications | NSF/ANSI 61 | US/Canada Plumbing Codes |
Compatibility & Fit(4) | ||
Flush Valve Compatibility | Universal | 3 Inch |
Flapper Diameter (inches) | 2 inches | 3.625 inches |
Toilet Type Compatibility | Standard | Gerber 99-788 / HET |
GPF Compatibility | 1.28-3.5+ | 1.28 |

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

Professional reviewers, including Home Improvement Expert Bob Vila, rate the Fluidmaster 502P21 as the best overall 2-inch flapper for addressing running toilets. It is praised for its ability to fix weak flushes, double flushes, and water waste. Manufacturer sources describe it as the 'gold standard' and 'high performance standard' due to its durability, adjustability, and Microban protection.
Search results do not provide direct consumer quotes or aggregated star ratings. However, implied praise from product pages suggests users value the reliable sealing, water savings, and ease of use for fixing running toilets. No recurring complaints are detailed in the available data.




The available search results do not contain professional reviewer assessments, editor commentary, or expert analysis regarding this product.
There is insufficient consumer sentiment data available, as the search results do not contain detailed user reviews, specific praise, or recurring complaints from everyday users.