This American Standard flush valve, for use with select toilets and urinals, features a self-cleaning brass piston with integral wiper spring which prevents clogging and reduces maintenance. The piston operation delivers superior flush accuracy and repeatability. The piston valve remains closed and does not need to be reset after a loss of water pressure. The handle on this flush value does not need to be held in the open position for flushing. The American Standard flush valve is made of durable chrome-plated cast brass construction and is ideal for commercial applications. It also features Chloramine-resistant EPFM seals. It has a adjustable tailpiece for rough-in flexibility.