Toto Aquia IV Dual Flush 1.28 and 0.9 GPF Toilet Tank Only with Washlet+ Auto Flush CompatibilityThe TOTO Aquia IV Dual Flush 1. 28 and 0. 9 GPF Auto Flush Compatible Toilet Tank is designed for use with the Aquia IV dual flush bowl. The Aquia IV tank includes a tank to bowl gasket, tank to bowl hardware, and toilet bolt caps. The Aquia IV tank features TOTO's Dual Max dual flush option, allowing you to proactively conserve water usage. The chrome center mounted push button that sits atop the tank allows you to choose between a 0. 9 GPF rinse or