Abstract: A quick-connect tube coupling includes a body member having a bore for receiving the end of a tube, a first counterbore adjacent the outer end of the body member for receipt of an annular ring portion of a gripper ring surrounding the tube, and a second smaller diameter counterbore between the bore and first counterbore for receipt of radially and axially inwardly extending gripper ring fingers. The second counterbore provides limited and controlled outward deflection of the gripper ring fingers when a pulling force is applied to the tube so that the fingers bite into the tube surface preventing the tube from being pulled out of the coupling. A hand-threaded nut on the outer end of the body member retains the gripper ring within the body member when a pulling force is applied to the tube. An O-ring seal is also desirably contained within the first counterbore axially outwardly of the gripper ring to form a seal between the tube and body member.

Abstract: A flareless tube coupling having screwed together body and nut members provided with oppositely tapered cam surfaces operative upon screwing together of the body and nut members to contract a tapered C-shaped grip ring within the nut cam surface into gripping engagement with a tube therewithin and to urge the axially inner end of a thin tubular sleeve into sealed engagement with the body cam surface and into gripping and sealing engagement with the tube, the large end of the grip ring having a plane end surface in engagement with the plane end surface of a radially enlarged collar at the axially outer end of the sleeve.