Fluidmaster 500 Flapper
Score: 75/100
Fluidmaster PerforMAX Flapper
Score: 88/100Rankings

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.
The Fluidmaster 500 is a universal 2-inch solid frame flapper designed for older 3.5+ GPF toilets, featuring Microban technology for durability. Its main limitation is the lack of adjustability and limited consumer feedback for long-term reliability. It is best suited for homeowners with standard 2-inch valves on older toilets needing a reliable, no-frills replacement.
| Attribute | Fluidmaster 500 Flapper | ![]() |
|---|---|---|
2 inchesbest | 2 inchesbest | |
1 countbest | 1 countbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | Fluidmaster 500 Flapper | ![]() |
|---|---|---|
Material & Durability(4) | ||
Material | Vinyl | Rubber/Plastic |
Chlorine Resistance | Unknown | true |
Hard Water Resistance | Unknown | true |
Water Resistance | Unknown | true |
Design & Features(4) | ||
Chain Material | Metal | Standard |
Chain Adjustability | false | true |
Installation Type | Standard | DIY |
Flapper Type | Solid Frame | Adjustable Flapper |
Packaging & Support(2) | ||
Warranty Period | 1 year | 5 Years |
Certifications | Unknown | NSF/ANSI 61 |
Compatibility & Fit(4) | ||
Flush Valve Compatibility | 2 inches | Universal |
Toilet Type Compatibility | Pre-1994 (3.5+ GPF) | Standard |
GPF Compatibility | 3.5+ GPF | 1.28-3.5+ |
Flush Valve Size | 2 inches | 2 |

Products in the top-left offer the best value (high score, low price).
The search results do not contain detailed expert reviews or professional editor assessments of the Fluidmaster 500.
The search results do not include consumer reviews, user testimonials, or common complaints from everyday users.

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.
