This Adjustable Oxygen Regulator goes on the standard red oxygen tank you can get at most any hardware store.  It allows you to control the flow as you oxygenate your beer wort.  It features brass construction and a 3/16" hose barb.  I do...

Comes with pump, sanitary filter, tubing, and Stainless Steel 2 micron diffusion stone. This system will never run out of oxygen. Great for helping your yeast propagate in the aerobic growth period.

2 micron stone, 1/2" diameter long, 1/4" barb

Filters down to .023 micron at 99.99%. Both 1/4" and 3/8" tubing will attachtubing will fit snugly in standard stopper.