Fluidmaster 3-Inch Complete, Adjustable Toilet Flush Valve Repair Kit.

The Fluidmaster 540AKRP5 3 in. Flush Valve Kit is an easy to install design that repairs leaks and saves water. The flush valve height adjusts up or down to fit more toilet models and sizes, while the 3 in. flapper also adjusts, to optimize performance and fine-tune how much water you use.