Tripp lite plc13rd red color 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 and 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 and connect it to any c13 outlet the insert strengthens the connection of the plug to the outlet ke