Made in Germany by C.M. Becker. For the gas side (usually marked IN) of a ball-lock equipped keg. This fitting has a 3/8" outer diameter stainless barb, and fits 5/16" interior diameter gas tubing. Good for connecting 5/16" interior diameter gas line found in many commercial kegerator systems directly to a keg.
To ease the 5/16" gas hose installation over the 3/8" barb and ensure a gas tight fit, heat the hose in hot water for a minute before installation.