American Standard 6047.121.002 Manual Flatwise 1.28 GPF Flush Valve, Chrome American Standard Manual Flush Valve, 1.28 Gpf Exposed manual toilet flush valve 1.28 GPF. Self cleaning brass piston with integral wiper spring prevents clogging and reduces maintenance The product is manufactured in China ADA compliant Self-cleaning brass piston with integral wiper spring prevents clogging and reduces maintenance Piston operation delivers superior flush accuracy and repeatability Piston valve remains closed and does not need to be reset after loss of water pressure Positive seal ensures leak-free performance