A connector assembly has a holder, a socket, a plug, a connecting tube and a holding element. The holder has two notches. Each notch has a groove defined in one side of the notch. The connecting tube is securely attached to the plug and has multiple teeth formed respectively at opposite ends of the diameter of the connecting tube and corresponding respectively to the notches in the holder. The holding element is U-shaped and attached to the holder, engages with teeth on the connecting tube and the grooves in the holder. The holder element has a middle segment and two tabs. The tabs extend perpendicularly from the ends of the middle segment and respectively into the notches. Each tab has two edges engaging respectively with the groove in the side of a corresponding notch of the holder and one of the teeth on the connecting tube.