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This is a Reef Fanatic CO2 Regulator with Electronic Solenoid and Needle Valve. The unit is in excellent condition except for some wrench bite-marks on the nut (from tightening).
As for why I am selling it: I originally received a faulty Reef Fanatics regulator, sent it back for warranty, bought another regulator in the mean time (couple of weeks), and now I have received a new Reef Fanatic Regulator. Obviously, I don't need two regulators.
I'm selling it for $100. This unit retails for $145.