The Mainstream Two-Piece Chair-Height Elongated Toilet from American Standard offers the worry-free reliability you expect from one of the industrys most trusted names for more than 140 years. This low-consumption toilet uses 20% less water than a regular toilet and is WaterSense certified for high efficiency. The Mainstream toilet is easy to install and features the easy-access comfort of a 16 ½-in. (42 cm) chair height and elongated front. Backed by an industry-leading warranty that includes lifetime on chinaware plus 2 years on mechanical parts, twice the industry standard of one year, you can be confident Mainstream will stand the test of time.