The Selectronic Urinal Flush Valves feature a self-cleaning piston design that saves time and money by eliminating routine maintenance and preventing the valve from running due to clogs.  The Selectronic flush valves include a pressure compensation feature that maintains the proper flush volume regardless of inlet water pressure.Features CR-P2 lithium battery installed. Battery Life:  4 years assuming 4,000 flushes per month  Touch-free operation helps keep the restroom clean and hygienic Pressure Compensation feature maintains accurate flush volume regardless of inlet water pressure Self-cleaning piston significantly reduces clogging and prevents valve run-on Integral wiper spring cleans the refill orifice with every flush for extraordinary reliability No Routine Maintenance no diaphragms to replace; no filters to clean Selectronic® Proximity System with programmable sensor allows for easy adjustment and customization  State-of-the-Art Electronics prevent ghost flushing Fully Mechanical Manual Override Button can flush the valve without power Fail-Safe: Valve automatically closes upon loss of power or water pressure and does not need to be reset Adjustable Sanitary Flush cleans the fixture & maintains the trap seal Stadium Feature: Valve automatically switches to water savings mode during periods of heavy usage Chemical Resistant EPDM Seals for extended life Can be installed left or right handed Specs 11-1/2” rough-in Fits 3/4" top spud urinals