Wellworth toilets have been an American benchmark for style, innovation, and performance since 1936. Part of the Wellworth collection, this high-efficiency 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 an insulated tank liner to help prevent condensation on the outside of the tank. Two-piece toilet. Elongated bowl offers added room and comfort. 1.28 gallons per flush (gpf). 2-1/8-inch glazed trapway. Standard left-hand trip lever included. Insuliner¬Æ tank liner minimizes condensation on the tank when exposed to high humidity. Combination consists of the K-4841-U tank and the K-4198 bowl. Coordinates with other products in the Wellworth collection. 14-inch rough-in.