KOHLER Highline 12 in. Rough In 2-Piece 1 GFP Single Flush Elongated Chair Height Toilet in Black Black, Seat Not IncludedKOHLER Highline 1. 0 GPF Black Toilet The KOHLER Highline Toilet blends sleek design with sustainable efficiency, saving over 4,000 gallons annually with its 1. 0 GPF system. Its comfort height elongated bowl and powerful Class 5 flush technology ensure convenience and cleanliness, making it ideal for both residential and commercial spaces. Key Features: Water Efficiency: Uses only 1. 0 gallons per flush, saving over 4,000 gallons per year compared to