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.