KOHLER K-3615-58 Gabrielle Comfort Height One-Piece Elongated 1.28 GPF Toilet with AquaPiston Flush Technology and Left-Hand Trip Lever, Thunder Grey Compact elongated bowl offers added comfort while occupying the same space as a round-front bowl Includes Grip-Tight Reveal Q3 toilet seat WaterSense toilets meet strict EPA flushing guidelines, including using at least 20 percent less water than 1.6-gallon toilets AquaPiston canister allows water to flow into the bowl from all sides, increasing the power and effectiveness of the flush Durable canister design has 90% less exposed seal material than a 3-inch flapper, for leak-free performance