KOHLER Corbelled 1.28 GPF Gravity Fed Single Flush Toilet Tank Only in DuneKOHLER Corbelled Gravity Flush Toilet Tank The KOHLER Corbelled Toilet Tank in Dune color offers an efficient 1. 28 GPF gravity fed flush while incorporating a ContinuousClean system that automatically dispenses cleaning solution. Its precision engineering ensures a powerful flush every time, making it perfect for residential settings. Key Features: ContinuousClean System: Automatically dispenses cleaning solution with each flush. Efficient