A retrofit system system for converting a conventional hot and cold water faucet arrangement to automatic electric control is disclosed. A solenoid valve and U-shaped tubes at either end are inserted into each riser. The valves are responsive to a control panel for setting flow rate and/or temperatu...http://www.google.fr/patents/US5184642?utm_source=gb-gplus-shareBrevet US5184642 - Automatic water faucet or water faucet controller
