An American classic, this Wellworth high-efficiency toilet tank reduces water consumption without compromising on flushing power. Its economical 1.28 gal flush setting provides significant water savings of up to 16,500 gallons per year compared to a 3.5 gal toilet. This tank features a protective lining coating the inside to prevent beaded moisture. It can be combined with a coordinated bowl for a customized ensemble. Kohler® Toilet Tank, Wellworth®, 1.28 gpf, Left Hand Lever Flush, 3-1/4 in Flush Valve, 12 in Rough-In, 13-15/16 in Height, 18 in Width, 8-1/2 in D, Vitreous China, Black