Self-closing quick disconnect with a built in check valve for pin lock cornelius kegs.
Transparent and dark grey coupling with two slots corresponding to the two pins on the gas post.
The check valve prevents liquid from traveling up into the gas system (which can happen with a regular disconnect if the liquid level is above the gas dip tube and the pressure in the keg is higher than in gas line).
Barb: 6.5 mm (1/4"). The gas line should be secured with a hose clamp.