This Ball Lock Gas Disconnect comes with a 1/4" barbed end already attached is intended for use with Gas Connections (Grey = Gas in kegging).
Attach your tubing, using a hose clamp (you'll need two in total, one for each end of the connection), hook up to your regulator or CO2 manifold, attach to keg, and you are ready to go. We recommend 3/16" or 1/4" beer tubing. Soak your tubing in hot water to make it more pliable before attaching it.