Fluidmaster Inc 502P21 Adjustable Flush Flapper

Product Description

The FLUIDMASTER INC 502P21 is an adjustable toilet flush flapper designed to give plumbers and fixture installers precise control over flush volume. A built-in dial mechanism allows the flapper to be tuned for a custom flush output, reducing water waste without sacrificing flush performance. The thermoplastic construction resists degradation in harsh or treated water conditions, and built-in Microban antimicrobial protection helps slow flapper breakdown caused by bacteria. This flapper is a direct drop-in replacement suited for standard residential toilet tank installations.

The 502P21 is intended for residential and light commercial toilet repair applications. It fits most standard toilet tanks, including 1.6-gallon low-consumption models. Plumbers and maintenance technicians typically install this flapper as a service replacement when the original flapper shows signs of warping, cracking, or seal failure causing phantom flush or continuous run conditions. The adjustable flush volume feature makes it a practical choice when upgrading older toilets for improved water efficiency.

Key Features

• Adjustable dial controls flush volume for a custom, optimized flush
• Built-in Microban antimicrobial protection inhibits bacteria-driven flapper degradation
• Thermoplastic material withstands harsh, heavily chlorinated, or hard water conditions
• Fits most standard toilet tanks including 1.6-gallon models
• Five-year manufacturer warranty

Compatibility

Fits most standard residential toilet tanks, including 1.6-gallon models, as stated by the manufacturer. Verify seat diameter and overflow tube clearance before installation.

Installation Notes

Installation is a standard plumber or experienced DIYer task. Before replacing the flapper, shut off the water supply valve at the base of the toilet and flush to empty the tank. Unhook the old flapper from the overflow tube ears and disconnect the chain from the flush handle arm before installing the 502P21. After installation, adjust the flush dial and test for proper seal and flush volume before returning the toilet to service.

Technical Specifications

• Material: Thermoplastic
• Antimicrobial Protection: Microban built-in
• Flush Volume: Adjustable, compatible with 1.6-gallon tanks
• Warranty: Five years
• Unit of Measure: Each
• Package Quantity: 21

Standard Information

• Brand: FLUIDMASTER INC
• Manufacturer Part Number: 502P21