The Fluidmaster K-400H-039 PerforMax Toilet Fill Valve and 2 in. Flapper Kit offers a high performance, saving-water replacement for your faulty fill valve and flapper. Quickly solve common toilet problems such as and nousy or running toilet fast. With EZ-Twist height that adjusts from 10 in. to 15 in. to fit most any tank. Also, featuring the PerforMAX Water-Saving Toilet Flapper, which featuring an adjustable dial to customize your water use depending on your needs. The solid frame ensures a secure seal, while the hard water resistant materials and built-in Microban technology fight bacteria and breakdown.