A quick-connect fitting or coupling assembly is adapted for releasably connecting and disconnecting a pair of fluid conduits in fluid communication with one another. The assembly includes a socket on one of the fluid conduits for receiving the other fluid conduit inserted longitudinally therein into an interlocking engagement with a resilient barb or finger member on a retainer member disposed within the socket. A removal member is selectively slidably movable in the socket for deflecting the barb or finger member out of such interlocking engagement in order to remove the previously inserted fluid conduit. The assembly also preferably includes lateral support members for laterally supporting the fluid conduits relative to one another and thus strengthening the connection therebetween. The preferred embodiment includes a feature by which the fitting assembly is relatively tamper-resistant.