It is mounted by the factory and does not interfere with the position indicator window with green and red indicators.
The model MS Monitoring Switch uses a power of up to 24 VDC, releasing 250 mA of current. It indicates to the monitoring device if the California valve is in an open or closed position. These signals can be issued via a signal cable in order to continuously notify a PLC, PC or an alarm system about the position of the valve.