Selectronic Exposed AC-Powered Toilet Flush Valve Base without Power SupplyThe Selectronic exposed AC powered toilet flush valve base model from American Standard includes an exceptional Selectronic proximity sensor that allows for hands free operation for easy, clean, and effective operation. With a maximum flow rate of 1. 28 gallons per flush, this water saving flush valve is designed for use with floor mounted or wall hung 1 1 2" top spud toilet bowls. This flush valve has self cleaning piston operation with integral