The transitional Drake® dual flush 1.28 and 0.8 gpf toilet tank with WASHLET® auto flush compatibility is designed for use with compatible Drake® dual flush toilet bowls. The Drake® tank features Toto® dual-max dual flush option, allowing you to proactively conserve water usage. The left side chrome trip lever allows you to choose between a 0.8 gpf rinse or 1.28 gpf for tougher jobs. This version of the transitional Drake® tank offers Toto® T40 WASHLET® and auto flush compatibility for when you are ready to upgrade to a hands-free flush system with electronic bidet seat. The transitional Drake® tank meets the standards for EPA WaterSense® and California's CEC and CAL Green requirements. This 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 or WASHLET® compatible Drake® bowls are CT746CUG for standard height and CT746CUFG for universal height. For WASHLET® auto flush compatibility use Drake® bowl models CT746CUGT40 or CT746CUFGT40.