Abstract: A quick connect coupling includes a connector with a countersunk bored opening therethrough, the countersunk opening providing a recessed enlarged cavity at one end of the connector and forming an annular male plug that extends into the cavity, a plastic tube extends through the bore of the connector and is provided with an annular upset bead on its inboard end that is positioned axially outboard of the annular male plug within the cavity, the connector being adapted to be pushed into assembled relation with an adapter having a stepped bore therethrough providing a socket opening at one end thereof of a size to receive the annular upset bead end of the tube and to slidably receive the annular plug of the connector, the socket at its inboard end terminating at a frusto-conical seal seat for engagement with the outboard tapered end surface of the annular upset bead of the tube, an O-ring seal being positioned to encircle the tube between its annular upset bead and the free end of the plug whereby to engage the