These quick disconnects can be used with the same diameter tubing on both sides or they can also be used for conversion, that change the tubing diameter on one side to another on the other side.
Halves are available for 0.040" and 0.063" inside diameter pneumatic lines. Available compatible accessories include; nylon tubing, polyurethane tubing, retaining springs and tubing pliers to assist in making all the pneumatic connections.