Hydrofix Toilet Repair Kit With Flapper, Saves Water, Detects Leaks, Cleans The Tank, Requires No Tools To Install, Signals When Properly Installed and Easily Calibrated For Full Flush Power, A Simple 1 Time Adjustment Allows The Customer To Calibrate The Rate At Which The Bowl Fills, Saving Up To 4 QT Of Water With Each Flush, Allows Height Of The Valve To Set After Installation and Even Under Pressure.