The Fluidmaster 550DFRK duoflush Complete Dual Flush Conversion System, offers everything you need to maximize your toilets performance. Use up to 45-Percent less water than the original tank parts. This complete fill and dual flush conversion system retrofits into any 2 inch flush valve toilet. Installation is simple and easy and you don't have to remove the toilet flush valve. This high performance toilet flush valve repair kit is adjustable and fits most toilet models. The included PerforMAX toilet fill valve regulates water flow and improves overall performance. Capable of both full and half flush, with a wide range of settings, this toilet flapper replacement features a 5-year warranty. Parts include a Dual Action Handle, a PerforMAX Fill Valve, a Duo Flush Valve, a Refill Clip, a Refill Tube, a Shank Washer, a Fill Valve Locknut, an Angled Seat Adapter (optional), a Dual Action Handle Locknut, a Roller Clamp, and Hose Clamps. The Fluidmaster Duo Flush System gives you a tool to help use less water and save money.