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This unit comes with a 9 volt DC solenoid coil, it is therefore handy if you are connecting the battery controller to an existing solenoid valve, screw the existing coil off the valve and replace it with this one. Also choose this model if you need a bigger solenoid valve, such as 1.5″ or 2″. It is a convenient, durable option for providing uninterrupted irrigation when AC-power is not available.