The Fluidmaster 242 Replacement Seal for Model #400A Fill Valves is a quick and easy way to restore your toilet fill valves performance. A direct replacement seal which fits the universal Fluidmaster 400A toilet fill valve, the No. 1 selling toilet fill valve worldwide. This part offers an easy way to solve common toilet fill problems without the need of purchasing a new toilet fill valve. Use this design to extend the life of an otherwise effective fill valve. Built with quality in mind this design comes with a 1 year warranty. The Fluidmaster Toilet Fill Valve Seal and simple DIY solution to common toilet fill problems.