FloWise Exposed Manual 1-1/2" Top Spud Toilet Flush Valve 1.1 GPFAmerican Standard FloWise manual flush valves are designed to meet the demands of high use space with labor saving installation, water saving operation, and time saving maintenance and care. This high efficiency 1. 1 gpf manual flush valve has a self cleaning brass piston with integral wiper spring to prevent clogging and reduce maintenance. The piston valve remains closed and does not need to be reset after loss of water pressure. Features a non hold