The Fluidmaster 507AP7 2" Flush Valve is designed to restore original factory performance to your toilet flush valve. Quickly replace cracked flush valves, and corroded toilet flappers. Featuring easy installation and a universal fit for all 2" flush valve toilets. Constructed from corrosion-resistant materials, with built-in Microban technology (flapper) for a long lifespan. The Microban is built into the flapper itself to fight bacteria and flapper breakdown. Including a solid frame flapper for a secure seal and superior leak protection. For use in 2" flush valve toilets with 3.5 or more GPF. Repair leaks between the tank and bowl with Fluidmaster's Universal 2" Flush Valve. 5 year warranty.