This Ball Lock Gas Disconnect comes with a 1/4" barbed end already attached. Attach your tubing, using a hose clamp, hook up to your regulator or CO2 manifold, attach to keg, and you are ready to go. 5/16" gas tubing will be loose on this fitting so make sure the clamp is snug. The gray color always mean gas in kegging. Please note: The product is featured on the right of the photograph.