Highline Arc The Complete Solution 2-piece 1.28 GPF Single Flush Elongated Toilet in White, Seat Included (3-Pack)Trusted for years by professionals, Highline toilets are KOHLER's bestselling toilet family. A brilliant blend of style and water efficiency, this Highline Arc toilet is distinguished by an elegant flared tank. Coupled with KOHLER's powerful canister flush valve, theres no sacrificing performance for design. An innovative 1. 28 gal. flush setting provides significant water savings of up to 16,500 gallons per year, compared to an old 3. 5 gal. toilet.