MJSI HYF450 DuoFlush Dual Flush Converter Toilet Repair Kit Easily converts standard 2 toilets and 2-1/2 flush valves into a two button dual flush toilet Adjustable valve height from 9-14 with a simple  turn No tools or tank removal needed for installation Eliminates common leaky toilet problems Includes both DuoFlush Converter and Fill Valve, that together will increase your toilets efficiency