KOHLER Persuade Curv Black 1.6-GPF Dual-Flush High Efficiency Toilet Tank

With its sleek symmetry, this Persuade Curv tank adds style to the bathroom without sacrificing comfort or water savings. An innovative nested trip lever offers the choice of 1.0 or 1.6 gallons 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 1.0-gallon flush setting reduces water use by more than 30 percent over 1.6-gallon toilets, which adds up to potential water savings of more than 5,000 gallons per toilet, per year.