The HydroRight Dual Flush Valve quickly and easily converts a standard toilet into a two-button, dual flush toilet. One button is the Quick Flush setting that uses significantly lowers water volumes for liquids and paper - the setting needed 4 out of 5 times. The second Full Flush button uses the normal amount of water for solids. Designed for drop-in installation, the HydroRight is the only converter that can be installed without tools and without having to remove the tank. The HYR270 replaces the flapper, chain and handle, therefore eliminating most common toilet problems. Fits 1.6 to 3.5+ gpf toilets with 2 In. flush valve. Permafit silicone seal is chemical resistant and will not warp.