This listing is for a single replacement High voltage 12V regulator for a V1 Nighthawk controller.
 
This requires the old regulator to be removed from the board, flux applied and the new regulator to be applied. The rear of the TO220 package needs soldering to the board itself so a sufficient board driven heatsink is created.
 
 
Note, this regulator can suit a V2 Nighthawk but it uses a different power circuit to run.