Abstract: A one-piece window connector assembly, or clip, is disclosed. The window clip is inserted into adjacent window spacers to permanently connect the spacers that form a window frame and space multiple panes of glass. The window clip includes a central base having first and second side rails that contribute to the overall rigidity of the window clip as the window clip is inserted into the window spacers. These-rails include locking barbs that enable the clip to permanently lock the window spacers together. The window clip is characterized by each rail extending from the central base through a reverse bend such that internal and external flaps are formed in the rails to increase the rigidity of the rails and assist in more efficient insertion of the window clip into the window spacers.