Item description from the seller

The New TOTO Drake Dual Flush 1.6 and 0.8 GPF Toilet Tank with WASHLET+ Auto Flush Compatibility is designed for use with compatible Drake dual flush bowl. The Drake tank features TOTO s 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 1.6 GPF for tougher jobs. This version of the 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. 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.