Barbed oxygen regulator for disposable oxygen bottles.  No gauge, knob on top adjusts pressure.  Left handed thread.  output is a 1/4″ barb.

Properly oxygenating your wort helps promote cell growth and healthy vigorous fermentations.

Also Consider: Oxygen Regulator via MoreBeer

Eagle Brewing FE378 Oxygen Regulator for Disposable Tanks with Barb