KOHLER K-3950-7 Tresham Comfort Height Two-Piece Elongated 1.28 GPF Toilet with AquaPiston Flush Technology and Left-Hand Trip Lever, Black Black Elongated bowl offers added room and comfort Comfort Height feature offers chair-height seating that makes sitting down and standing up easier for most adults 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