The KOHLER® San Souci one-piece toilet offers a sleek, contemporary design with a convenient chair-height and elongated bowl for comfortable use. This one-piece elongated toilet 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.