PRO55 Fluidmaster Pro Series Universal 2" Adjustable Flexible Frame Toilet Flapper The Fluidmaster PRO55 Pro Series Universal 2" Adjustable Toilet Flapper. Stop a running toilet with this Pro Series toilet flapper. Includes an adjustable float to control tank water levels. A flexible design made to fit 2" flush valves. Upgrade a faulty flapper with this Pro Series chlorine-resistant toilet flapperUniversal design to fit most 2” flush valvesFast and easy to installFlexible design fits on flush valves with, or without mounting earsChorine and hard water resistant durable buildAdjustable float controls tank water level to optimize flushBuilt-in Microban technology to fight bacteria5 year warranty