For flushometer bowls with 1-1/2-inch (38 mm) exposed top spud 8-year CR-P2 lithium battery installed in valve Touchless operation limits the spread of germs Exclusive DynaClean® self-cleaning wiper spring technology Integral wiper spring cleans refill orifice with every flush to help prevent valve run-on Fully mechanical manual override can operate without power Fail-Safe operation: Valve automatically closes upon loss of power or water pressure Proprietary brass alloy resists dezincification 11-1/2" (292 mm) rough-in The Exposed Selectronic® Toilet Flush Valve is now capable of meeting ADA clearance requirements when installed under a grab-bar that is installed at 36” height from the floor to the top of the bar.  The self-cleaning piston design saves time and money by eliminating routine maintenance and preventing the valve from running due to clogs.Features CR-P2 lithium battery installed. Battery Life: 8 years assuming 4,000 flushes per month  Touch-free operation helps keep the restroom clean and hygienic 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. Chemical Resistant EPDM Seals for extended life Can be installed left or right handedSpecs 11-1/2” Rough in Fits  1-1/2" top spud bowls