BEST-IN-CLASS: The Selectronic toilet flush valve by American Standard has a self-cleaning piston design that eliminates routine maintenance and prevents the valve from running; proximity system with programmable sensor allows for easy customization FEATURES: Toilet flush valve has an integral wiper spring cleans the refill orifice with every flush; American Standard toilet parts deliver reliable operation even with poor water quality; for flushometer bowls with 1-1/2 in. (38 mm) exposed top spud FLAWLESS DESIGN: This toilet flush valve has state-of-the-art electronics that prevent ghost flushing and a fully mechanical manual override button can flush the valve without power; proprietary brass alloy resists dezincification SIZE: The American Standard Exposed Selectronic toilet flush valve is capable of meeting ADA requirements when installed under a grab-bar that is installed at 36 in. height from the floor to the top of the bar INCLUDES: American Standard toilet flush valve also includes a 8-year CR-P2 lithium battery installed; has no diaphragms requiring replacement or filter screens requiring cleaning Dc Powered 27 Inch Rough In Battery Included