American Standard 6065.121.002 Exposed 1.28 Gpf Toilet Flush Valve for 1-1/2-Inch Top Spud Bowls with DC Power, Rough Brass Self-cleaning piston eliminates routine maintenance. No diaphragms to replace or filter screens to clean. Integral wiper spring cleans the refill orifice with every flush. Delivers reliable operation even with poor water quality Hygienic, touch-free operation Flexible Selectronic Platform with programmable sensor Fully Mechanical Manual Override allows valve to flush during a power failure Dc Powered 27-Inch Rough-In Battery Included