The TOTO Eco Clayton and Clayton Universal Height Elongated Toilet Bowl is designed for use with the Eco Clayton ST784E 1.28gpf or Clayton ST784S 1.6gpf tank. The bowl features an extra-large siphon jet, and a large trapway. The bowl is designed to feature TOTO’s Universal Height which allows for a more comfortable seat position across a wide range of users. The bowl is ADA compliant and when paired with the Eco Clayton ST784E 1.28gpf tank, it meets the standards for EPA WaterSense®, and California’s CEC and CALGreen requirements. Additional items needed for installation and use must be purchased separately: tank, wax ring, toilet mounting bolts, water supply lines, and toilet seat.