PRO53 Fluidmaster Pro Series Universal 2" Flexible Frame Toilet Flapper The Fluidmaster PRO53 Pro Series Universal 2" Flexible Frame Toilet Flapper. Stop a running toilet with this flexible frame toilet flapper. Designed to fit 2" flush valve toilets.Upgrade a faulty flapper to this Pro Series toilet flapperUniversal design to fit most 2” flush valvesFast and easy to installFlexible design fits on flush valves with, or without mounting earsKink-free metal chain to avoid flapper hang-upBuilt-in Microban® technology for durability1 year warranty