Genuine VIQUA replacement part. The VIQUA 650733R-002 controller helps control voltage for your VIQUA D4 system. SAFETY STANDARD: VIQUA controllers are proven to be reliable and allow you to seamlessly control the voltage going to your UV system.The 650733R-002 by VIQUA is a replacement 40W controller for D4, D4V, IHS12-D4, IHS22-D4. It no longer features dry contacts for switching external devices, such as a solenoid valve, in the event of lamp failure. These new controllers feature a new optimized locking connector allowing full engagement of the connector to the lamp, fewer assembly steps, and fully integrated into the existing connector design to ensure no parts become loose or lost.