The Fluidmaster 502 PerforMAX 2 in. Water-Saving Flapper is a top choice for flush efficiency. Featuring the PerforMAX water-saving adjustable dial to optimize your flush performance and water usage. A toilet flapper built durable, featuring Microban and corrosive resistant materials for a long life. While the solid frame ensures a secure seal with every flush. The universal design fits most 2 in. flush valve toilets, from 1.28 HET to 3.5 GFP designs. A highly effective design that offers simple and easy installation saving on DIY toilet repair time. Save water and money, while solving common flush and running toilet problems with this 2 in. toilet flapper replacement. Only Fluidmaster has toilet flappers with built-in Microban protection. The Microban protection keeps the flapper cleaner by fighting flapper breakdown due to bacteria on the flapper itself.