This 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 tank with the K-4144 bowl for a complete Corbelle skirted toilet. 1.28 gallons per flush (gpf). Left-hand Polished Chrome trip lever included. Supply line not included. Combines with the K-4144 bowl to create a complete K-3814 Corbelle toilet.