KOHLER Wellworth 1.1 GPF/1.6 GPF Dual Flush Toilet Tank Only in White

This Wellworth dual-flush toilet tank combines water savings with powerful flush performance. An innovative 2 tone flush lever offers the choice of 1.1 or 1.6 GPF (gal. per flush), the dual-flush lever is located on the side of the tank like a traditional toilet, leaving the top free for storage. The high-efficiency 1.1 gal. flush reduces water use by more than 30% over the 1.6 gal. mode, which adds up to potential water savings of more than 4,000 gal. per toilet, per year.