For use in all Blackcomb 5.1/6.1 products. Install a NORMALLY CLOSED line voltage solenoid valve (not supplied) into this junction box. Connect the power and the supplied lead to the controller. Please note that when this device is connected to a blackcomb 5.1 system (without the UV model), then the solenoid will close on a lamp failure mode only. When used on a Blackcomb 6.1 system the solenoid will close when the UV level drops below 50%. Also note that in cases where emergency use of untreated water is required, the controller an be placed into a manual override mode allowing for the flow of water in an alarm condition.