Ultima Selectronic Touchless Urinal Flush Valve, Piston-Type, Base Model, 1.0 gpf/3.8 LpfPOWER KIT MUST BE PURCHASED SEPARATELYFor urinals with 3/4-inch (19 mm) exposed top spudTouchless operation limits the spread of germsExclusive DynaClean self-cleaning wiper spring technologyIntegral wiper spring cleans refill orifice with every flush to help prevent valve run-onFully mechanical manual override can operate without powerFail-Safe operation: Valve automatically closes upon loss of power or water pressurePressure Compensation feature ensures accurate flush volume regardless of inlet water pressureProprietary brass alloy resists dezincification11-1/2″ (292 mm) rough-in