The Fluidmaster K-400H-043 Universal Performax toilet fill valve with 2 in. & 3 in. Super Flapper is the newest kit with the most technologically advanced universal toilet flapper and fill valve on the market. It takes all the guess work and uncertainty out of deciding what pieces or sizes of flappers to buy to fix your toilet. This is the only toilet repair kit you need. The Performax fill valve sets the standard for performance and is quick and easy to install. Toilet flush systems have different size flappers, the Super Flapper is the go-to choice, taking the guessing out of knowing what size flapper you need. This Super Flapper can be converted to a 2 in. toilet flapper or a 3 in. toilet flapper. It is quick to convert and easy to install. Both the flapper and the fill valve have water adjustment features with easy to turn dials that allow you to control and customize the water usage in your toilet. You can use the dials for a more powerful flush or water savings. This universal design of this 2-Piece toilet repair kit is built to adjust and work with most toilet brands with flapper flush systems. Turn your super annoying toilet problem into a super easy fix. Best for use in 1.28, 1.6 or 3.5 GPF models.