Give your customers a long lasting flapper seal with Fluidmaster's PRO Series Flappers. Only Fluidmaster has toilet flappers with built-in Microban® protection that actively inhibits bacteria growth that contribute to flapper breakdown. The PRO56 is our most versatile 2'' Flapper. Giving you the most effective flushes, the PRO56 adjustable dial allows you to fine tune how much water is flushed. This feature makes it suitable for 1.28 - 3.5+ gallons per flush. The PRO56 Flapper is chlorine and hard water resistant, and comes equipped with a solid frame that won't twist for a perfect seal every time.