All PM 123 units feature Park quality welded steel construction, with corrosion-proof louvers at the top and bottom and space heaters inside to maintain air circulation and keep the interior dry. Three point cam-type, high strength latches and screened louvers discourage tampering. Wide bulkhead doors provide easy access. Each full length door has durable heavy-duty hinges with brass pivots. Front operated holders lock the doors open and provide ample room for pulling cables and making terminations.