Tripp lite plc19rd red color 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 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 c20 input cord and connect it to any c19 outlet the insert strengthens the connection of the plug to the outlet ke