KOHLER Wellworth 1.0 GPF Single Flush Toilet Tank Only in Black BlackKOHLER Wellworth Black Single Flush Toilet Tank The KOHLER Wellworth Single Flush Toilet Tank in sleek black offers a high efficiency 1. 0 GPF flush that significantly reduces water usage without compromising performance. Designed to pair with the K 5297 bowl, this tank uses Gravity Fed Flushing Technology for powerful siphoning action and is EPA WaterSense certified for eco friendliness. Key Features: Efficient Water Usage: Uses just 1. 0 gallon per