Featuring a flexible design, the 5051 flapper offers the versatility of fitting both flush valves with or without mounting ears. This flapper comes equipped with an adjustable float to help you regulate how much water is flushed by simply moving the float up or down. Only Fluidmaster has toilet flappers with built-in Microban protection. Not just simply a coating, Microban is specially built into the construction of our flappers to fight flapper breakdown and combat bacteria. Adjustable float, move down for more water, up for less water. Adjustable float, move down for more water, up for less water. Flexible design, fits on flush valves with or without mounting ears. Built-in Microban fights breakdown due to bacteria. Chlorine and hard water-resistant.