Detail of water closets(Auto) and lavatory is given in the Autocad DWG drawing file. Sensor is provided to the water clsoets. The sensor detects when infrared light is reflected from the user. A small microchip sets rules to reduce the chance of a spurious activation when a person simply walks past the sink or toilet. When necessary, the switch sends an electric current that activates the faucet or toilet's valve. Thank you for downloading the Autocad 2D DWG drawing file and other CAD program files from our cadbull website.