Marketing InformationGive your customers a long-lasting flapper seal with Fluidmaster® 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 in 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 to 3.5+ gpf. 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.