This watersense -labeled high-efficiency toilet tank combines water conservation with the versatile style of the 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 tank features innovative AquaPiston technology, a patented flush engine that delivers a fast, powerful, and virtually plug-free flush. Pair this tank with the k-5309 bowl for a complete Cimarron skirted toilet.