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 Electronic flush valve with Selectronic? proximity system for hygienic "Hands Free" operation Self-cleaning brass piston with integral wiper spring prevents clogging and reduces maintenance Fully Mechanical Manual Override - allows valve to flush during a power failure Fail-Safe Operation - valve automatically closes, and does not need to be reset, upon loss of power or water pressure Adjustable Sanitary Flush - valve can automatically flush after 24 hours of non-use to maintain trap seal