KOHLER K-4446-96 Devonshire Class Five High Efficiency Toilet Tank, Biscuit DryLock attachment plate reduces installation time by 40-percent, as well as prevents potential leak points during the installation and throughout the life of the product Combines with the K-4288 Devonshire Comfort Height elongated toilet bowl to create K-3678 Devonshire Comfort Height 1.28-gallon elongated toilet with Class Five flushing technology Meets strict flushing performance guidelines established by the EPA (Environmental Protection Agency) WaterSense program 12-Inch rough-in 1.28 gpf High-efficiency toilets provide significant water savings of up to 16,500 gallons per year versus an old 3.5 gallon toilet without sacrificing performance