Greener Flusher Dual Flush Toilet Retrofit Kit - IAPMO Certified / UPC American/Canadian Standards Converts your toilet into a High Efficiency Toilet / Fixes undetected flapper leaks Retrofits 3.5 and 1.6 GPF Toilets / Easy installation in less than 30 minutes! 50% Water Savings when flushing liquid waste / Saves 2,500 Gallons per person annually 5 Year Manufacturer Warranty Guarantee on parts / Over 10 Million Sold Worldwide!