This high-efficiency toilet tank combines water conservation with the versatile style of the KOHLER® Cimarron collection. A 1.28-gallon flush provides significant water savings of up to 16,500 gallons per year, compared to a 3.5-gallon toilet, without sacrificing performance. This 1.28 gpf toilet tank features innovative AquaPiston® technology, a patented flush engine that delivers a fast, powerful, and virtually plug-free flush. Pair this toilet tank with a Cimarron toilet bowl for a beautiful, sleek two-piece toilet.