The TOTO Eco Drake and Drake ADA Height Elongated Toilet Bowl is designed for use with the following tanks: Eco Drake ST743E 1.28gpf, Eco Drake Transitional ST744E 1.28gpf, or Drake ST743S 1.6gpf. The bowl features an extra-large siphon jet, and a large trapway. The bowl is designed to meet ADA seat height requirements. When paired with the Eco Drake ST743E 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.