The Fluidmaster Fill Valve and Flapper Kit includes the 400A Fill Valve, and 501 Flapper. Replace a leaky flapper and a damaged fill valve in one kit. This universal design repair kit will fit most 2" flush valve toilets in one easy to install model. Featuring the top selling toilet fill valve worldwide, the 400A. A code approved anti-siphon fill valve, with EZ-twist adjustable height from 9" to 14" to fit more tanks. Also, including the 501 Solid Frame Flapper for a secure seal with every flush. Built durable from chlorine resistant materials with built-in Microban technology for long lasting use. Microban is specifically built into the flapper to fight breakdown and combat bacteria. Solve common toilet problem fast, with this trusted and proven Fluidmaster Fill Valve and Flapper Toilet Repair Kit. Best for older 3.5+ gallons per flush toilets with 2" flush valves.