The Fluidmaster 523A-009 Universal 2 inch and 3 inch Super Flapper is the newest and most universal toilet flapper in our flapper line. The Super Flapper is the go to choice, taking the guessing out of what size flapper is needed in the tank. When you don't know what size flapper you need This universal flapper fits both 2 inch and 3 inch toilet flush valves. This can be converted into a 2 inch toilet flapper or a 3 inch toilet flapper with just a few simple adjustments. This Super Toilet Flapper sets the standard as the easiest installation possible for a flapper. Depending on your flush needs the water adjustment feature with the easy-to-turn adjustment dial allows for the customization of water usage inside the tank to maximize your flush and save water. This universal design is built to adjust and work with most toilets and brands using 2-piece toilets and 2 in. or 3 in. toilet flush valves. Best for use in 1.28, 1.6 and 3.5 GPF toilets.