Tripp Lite PLC19RD Plug-lock inserts prevent accidental disconnection of C20 plug-in power cords from C19 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 C20 input cord & connect it to any C19 outlet. The insert strengthens the connection of the plug to the outlet, keeping critical equipment plugged-in & running during routine rack access & maintenance.