The 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 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 tank meets the standards for EPA WaterSense, and California's CEC and CALGreen requirements. Additional items needed for installation and use must be purchased separately: toilet bowl, wax ring, toilet mounting bolts, and water supply lines.
The Toto Aquia toilet tank is excellent and lives up to Toto’s reputation for quality. The design is sleek and modern, pairing perfectly with the Aquia bowl for a clean, streamlined look. The tank feels solid and well made, and the flush performance is powerful and efficient while using minimal water. Installation was straightforward, and everything fits together perfectly. Reliable, quiet, and stylish—this is a top-quality product that I would highly recommend.. Austin. Thu Jan 22 2026