The Toto Aquia IV Arc Dual Flush 1.28 and 0.9 GPF Toilet Tank Only with Washlet+ Auto Flush Compatibility is designed for use with the Aquia IV dual flush bowl. The curved shape offers a contemporary and sleek design to complete your bathroom. Features Toto's dual-max dual flush option, allowing you to proactively conserve water usage, allowing you to choose between a 0.9 GPF rinse or 1.28 GPF for tougher jobs. This version of the Aquia tank offers TOTO T40 Washlet®+ and auto flush compatibility for when you are ready to upgrade to a hands-free flush system with an electronic bidet seat. The Aquia IV Cube tank meets the standards for EPA WaterSense, and California CEC and CALGreen requirements. The Aquia IV arc 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, and water supply lines.