KOHLER K-4458-0 Wellworth Dual-Flush Tank, White none Imported Left-hand nested trip lever offers a choice of 1.1 or 1.6-Gallons per flush Combines with the K-4197 or K-4198 bowl to create a complete K-3987 or K-3988 Wellworth toilet Combines with the K-4199 bowl to create a complete K-3989 Highline toilet Coordinates with other products in the Wellworth collection WaterSense toilets meet strict EPA flushing guidelines, including using at least 20-Percent less water than 1.6-Gallon toilets