For a complete flush system upgrade the Fluidmaster 507AK Complete 2 inch Toilet Flush valve Repair Kit is the top choice. This toilet repair kit includes the water-saving 2 inch PerforMAX toilet flapper, which an adjustable dial to customize water use per flush. And the flush valve can be trimmed to fit more tanks. The solid frame flapper design ensures a secure seal eliminating leaks. Built to fit most 2 inch flush valve toilets this kit includes a replacement flush valve, a flapper, a universal gasket and hardware. Suitable for 1.6 GPF, or 3.5 GPF toilets, and showcasing a chlorine and hard water resistant material build. Repair and replace leaky flappers, cracked valves, or corroded gaskets with one kit. The Fluidmaster PerforMAX flush valve repair kit has all you need to restore your toilets flush.