KOHLER Wellworth Classic 1.28 GPF Single Flush Toilet Tank Only with Class Five Flushing Technology in Black BlackKOHLER Wellworth Classic Black Toilet Tank The KOHLER Wellworth Classic Toilet Tank in sophisticated Black offers a powerful and efficient flush with its Class Five technology, while using only 1. 28 gallons per flush. Designed to reduce water usage and enhance your bathroom's modern aesthetic, this tank seamlessly combines function and style. Key Features: Efficiency: Utilizes just 1. 28 gallons per flush, conserving water and meeting EPA WaterSense