Fluidmaster 242 Toilet Fill Valve Seal Replacement Part, Fits 400A Fill Valve Extend the life of your 400A toilet fill valve. Easy-to-install. A replacement seal for the universal design 400A fill valve. Simple and quick DIY replacement. 1 year warranty. Fix an old toilet valve seal without purchasing another fill valve. Limit one (1) per order Returns will not be honored on this closeout item