KOHLER Highline 12 in. Rough In 2-Piece 1 GFP Single Flush Elongated Chair Height Toilet in White, Seat Not IncludedKOHLER Highline 1. 0 GPF Chair Height Toilet The KOHLER Highline is a water conserving powerhouse that seamlessly combines style and functionality. With a 1. 0 gallon per flush system, this toilet saves more than 4,500 gallons of water per year per fixture. Featuring an elongated bowl and chair height design, it ensures superior comfort and ease of use. Key Features: Water Efficiency: Consumes only 1. 0 gallons per flush, exceeding EPA WaterSense