Fluidmaster 502P21 2-Inch Universal PerforMAX Longest Lasting, Water Saving Toilet Flapper This PerforMAX Water-Saving Flapper helps solve common running toilet problems Easy-to-install Fits 2 flush valve toilets Universal PerforMAX design fits most toilet models Replace corroded and leaky flappers 5-year warranty Save on water usage with this dial adjustable flapper! Adjusts for maximum flush efficiency Fixes most common cause of a running toilet Rigid frame aligns flapper properly on every flush Micro ban prevents growth of harmful microbes