Abstract: Described are embodiments of a pipe fitting or connector. The fitting may be used as an atomic element in constructing a variety of different structures, such as shelving formed from pipes, rods, tubular structures and the like that may be connected using a pipe fitting. The pipe fitting may include a punched hole in a top portion and a matching punched hole in a corresponding bottom portion of a sleeve into which a pipe may be inserted. The holes may be used as a visual indicator that the pipe is fully inserted in the fitting. The holes in the top and bottom portions of the sleeve may also be used with a fastener to securely hold an inserted pipe in place by passing a fastener through the holes in the top and bottom portions of the sleeve and also passing the fastener through corresponding holes in the inserted pipe.