The Fluidmaster K-400A-5004 Universal Toilet Fill Valve and 2 in. Toilet Flapper Repair Kit is the No. 1 solution to fix noisy and running toilets. A complete fill and flush toilet repair kit that includes the trusted Fluidmaster 400A toilet fill valve and the Fluidmaster 501 2-in. flapper. With quick and easy installation and a 5-year warranty, this kit is perfect for a DIY upgrade, best with 3.5+ GPF toilets. This replacement toilet repair kit solves most common toilet fill problems, with the proven 400A toilet fill valve and its anti-siphon design, while the reliable 501 2 in. flapper helps prevent leaks, with a solid frame build, and durable materials. For a quick DIY solution for both fill and flush problems, Fluidmaster's K-400A-5004 Universal Toilet Fill Valve and 2 in. Toilet Flapper Repair Kit is the top choice. Enhance your toilet's overall performance with this proven Fluidmaster kit.