KOHLER Wellworth toilets have been an American benchmark for style, innovation, and performance since 1936. Part of the Wellworth collection, this high-efficiency two-piece elongated toilet provides significant water savings of up to 16,500 gallons per year, compared to an old 3.5-gallon toilet, without sacrificing flush power. This model includes tank lid locks and an insulated tank liner to help prevent condensation on the outside of the tank.