Highline Arc The Complete Solution 2-piece 1.28 GPF Single Flush Round-Front Toilet in White, Seat Included (3-Pack)Trusted for years by professionals, Highline toilets are KOHLERs bestselling toilet family. A brilliant blend of style and water efficiency, this Highline Arc toilet is distinguished by an elegant flared tank. Coupled with KOHLERs 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.