The TOTO Drake II 1G and Vespin II 1G, 1.0 GPF Toilet Tank is designed for use with the Drake II or Vespin II bowl. The Drake II 1G and Vespin II 1G features TOTO's industry leading 1G technology offering a powerful flush that flushes completely and fully with only one gallon of water. The TORNADO FLUSH system uses a hole-free rim design with dual-nozzles that creates a centrifugal washing action that assists in rinsing the bowl more efficiently. This version of the tank comes equipped with a left-hand chrome trip lever. The Drake II 1G and Vespin II 1G meets the standards for EPA WaterSense, and California’s CEC and CALGreen requirements. The Drake II 1G and Vespin II 1G tank includes a tank to bowl gasket, tank to bowl hardware, and toilet bolt caps. Additional items needed for installation and use must be purchased separately: toilet bowl, wax ring, toilet mounting bolts, water supply lines, and toilet seat. The Drake II 1G and Vespin II 1G ST453UA tank is designed to be used with Drake II and Vespin II bowls only.