The Fluidmaster 502 PerforMAX 2” Water-Saving Flapper is a top choice for flush efficiency. The PerforMAX water saving adjustable dial design to optimize your flush performance and water use. Built durable for a long life, this flapper is constructed with corrosive resistant materials and a solid frame that won’t bend for a secure seal. A universal design that fit’s most 2” flush valve models, best with 1.28 HET and 1.6 GPF toilets, and can work with 3.5 GPF. This highly efficient design also features simple and easy installation saving on DIY toilet repair time. Save on water, money and solve common flush and running toilet problems with this 2” toilet flapper replacement