The HydroClean Toilet Fill Valve solves the two biggest reasons for water loss in toilets: miscalibration and leaks. It easily calibrates to adjust the exact amount of water needed in the tank. A unique feature is the leak detection and signals when a leak is found. It is designed to fit standard toilets and installs easily without tools.Water-saving toilet fill valve detects leaks,Installs easily without tools,Easy calibration assures full flush power