Mansfield Reo single 4"center UnderMount Model 226-BISC is a Biscuit 22?x17?rectangular sink with. Is mounted to a counter top for easy quick installation The Mansfield Reo 4"center UnderMount Lavatory Model 226--BISC is made of a durable vitreous china material with a concealed overflow. The Mansfield Reo 4"center UnderMount Lavatory Model 226-BISC comes with the limited lifetime Mansfield warranty. Mansfield is an American company that?s been in business since 1929, and has been one of the top producers in design, and quality for the past 40 years. They are the largest domestic producer of sanitary ware, and strive to ensure you get the best products available.