Abstract: A first tubular member having an axially extending central cavity with opposed substantially flat walls receives through its open end a connector which is adapted to be clamped against the opposed flat walls and to secure the end of the first tubular member against an exterior wall of a second tubular member which has a laterally directed undercut recess in a side wall thereof for engagement by corresponding portions of the connector. The connector has first and second substantially rigid legs with respective head portions with inclined surfaces which engage in the undercut recess in the side wall of the second tubular member so as to pull the tubular members together and hold them in the desired position; the rigid legs have respective tail portions at the opposite ends thereof from the head portions, and a connecting element has means for biasing apart the rigid legs and interconnects said tail portions and by virtue of recesses for receiving in push fit interengagement said tail portions.