Fluidmaster 513a 3 in. universal toilet tank flapper. a durable silicone seal promotes long life and lasting performance. a standard 10-year warranty is included. this model features fast and easy installation that saves time and quickly upgrades your toilet water usage per flush. built to replace many toilet flapper brands including mansfield, toto, american standard, kohler, glacier bay, gerber and more. suitable for 1.28 het and 1.6 gpf models with a 3 in. toilet flush valve. the solid frame secures a proper seal, while the adjustable dial maximizes your toilets performance.