The Fluidmaster 242C Toilet Fill Valve Seal is a simple DIY solution to common toilet fill valve problems. This replacement seal fits the Fluidmaster 400A toilet fill valve along with 200 and 747 models. Fix your faulty or slow toilet fill valve without having to purchase a new toilet fill valve. Utilize this durable rubber design to extend the life of a currently ineffective fill valve. Built with quality in mind this model comes with a 1-year warranty and works with all water pressures. The Fluidmaster Replacement Toilet Fill Valve seal is the quickest and easiest way to restore your toilet fill valves performance.