This KOHLER® Corbelle toilet tank features innovative AquaPiston® technology, a patented flush engine that delivers a fast, powerful, and virtually plug-free flush. 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. Pair this toilet tank with a Corbelle toilet bowl for a beautiful, sleek two-piece toilet. Kohler® Toilet Tank, Corbelle®, 1.28 gpf, Left Hand Lever Flush, Vitreous China, Dune