Complete this section only if you have a MASTER VALVE or a PUMP START RELAY for a pump installed.  A master valve is a normally closed valve installed at the supply point of the mainline that opens only when the automatic system is activated. A pump start relay is an electronic device that uses a signal current from the irrigation controller to activate a pump to provide water to your system. When a pump is to be operated by the controller, a pump start relay is typically used. Hunter offers a full range of Pump Start Relays for most applications. The default is for all stations to have the master valve/pump start circuit ON. The master valve/pump start can be set ON or OFF by station, regardless of which program the station is assigned.