This nickel plated brass hose barb features a tapered 3/8" hose barb, and screws into our P21 Oxygen
Regulator, so you can hook up 3/8" tubing to supply aeration stones with 3/8" hose barbs.
Note: This fits full size (6½" long including stem) Brewer's Edge Oxygen Regulators sold after April 1st, 2017. It does not fit the previous shorter Brewer's Edge Oxygen Regulator, just the current full sized model.
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