These ball-lock disconnects fit onto the 'IN' disconnect post on a Cornelius keg. They allow the means for gas to be injected into the keg.
Choose either metal hose barb (1/4"/6mm) for rubber or polythene tubing, or 3/8" push-fit for p/p gas-line or 3/8" copper tubing.
(Flexible tubing pushes onto hose barbs. 'Rigid' tubing fits inside a John Guest push-fit.)
If you require connections for 5/16" or 3/16" beer/gas line you will need the relevant stem reducer fitting.
top left - disconnect with screw on hose barb
top right - disconnect with 3/8" John Guest push-fit
bottom left - disconnect with moulded metal hose barb
bottom right - disconnect with thread