Fluidmaster 502p21 Adjustable Toilet Flapper 2 Inch

Product Description

The FLUIDMASTER 502p21 is a 2-inch universal adjustable toilet flapper engineered for residential toilet repair and water conservation. It fits 1.28, 1.6, and 3.5 GPF toilets and replaces worn, corroded, or leaking flappers without special tools. An integrated adjustment dial lets technicians and installers set the exact flush volume needed for the fixture — turn the dial left to increase water per flush or right to reduce it. The flapper is built with antimicrobial protection integrated into the material itself, not applied as a surface coating, helping extend service life and resist bacterial degradation. Plumbers and maintenance professionals install this as a direct upgrade over standard 2-inch flappers.

The 502p21 is suited for residential toilet repair work where the existing flapper is causing incomplete flushes, phantom running, or visible leakage at the flush valve seat. Its adjustable design makes it a practical single-SKU solution for properties with mixed GPF toilets, reducing the need to stock multiple flapper variants. Licensed plumbers, maintenance techs, and qualified DIYers use this flapper during routine toilet service calls.

Key Features

• Adjustable flush volume dial compatible with 1.28, 1.6, and 3.5 GPF toilets
• Antimicrobial protection built into the flapper material for long-term resistance to bacteria and breakdown
• Universal 2-inch sizing for broad replacement coverage
• Addresses common flapper failure modes including leaks and running toilet symptoms
• 5-year manufacturer warranty

Compatibility

Designed as a direct replacement for standard 2-inch toilet flappers in 1.28 GPF, 1.6 GPF, and 3.5 GPF residential toilet applications.

Installation Notes

Shut off the water supply at the fixture stop valve and flush the toilet to drain the tank before removing the old flapper. This installation falls within standard plumbing maintenance scope and does not require special tools or permits in most jurisdictions. After seating the new flapper on the flush valve, adjust the dial to match the toilet's rated GPF before restoring water supply and testing for leaks at the valve seat.

Technical Specifications

• Flapper Size: 2 inches
• Compatible Flush Volumes: 1.28, 1.6, and 3.5 GPF
• Unit Length: 2.36 inches
• Unit Width: 4.33 inches
• Unit Height: 7.48 inches
• Warranty: 5 years
• Country of Origin: Mexico

Standard Information

• Brand: FLUIDMASTER
• Manufacturer Part Number: 502p21