American Standard 6045.101.002 Exposed Manual 3/4-Inch Top Spud 1.0 Gpf Urinal Flush Valve, Polished Chrome Self-cleaning brass piston with integral wiper spring prevents clogging and reduces maintenance Piston operation delivers superior flush accuracy and repeat-ability Piston valve remains closed and does not need to be reset after loss of water pressure Positive seal ensures leak-free performance Durable chrome-plated cast brass construction is ideal for commercial applications