Tripp Lite PLC13RD plug-lock inserts prevent accidental disconnection of C14 plug-in power cords from C13 output receptacles. IEC 60320 plug-in electrical cords are frequently loose-fitting & are often subject to accidental disconnection during routine network maintenance. To prevent critical equipment plugs from getting knocked loose, place a Plug-lock insert over any C14 input cord & connect it to any C13 outlet. The insert strengthens the connection of the plug to the outlet, keeping critical equipment plugged-in & running during routine rack access & maintenance.