Tripp Lite PLC13BL Plug-lock inserts prevent accidental disconnection of C14 plug-in power cords from C13 outlets BLUE color PLC13BL inserts ship in packages of 100 pieces Corrects loose-fitting IEC60320 power connections that could lead to accidental disconnection of power cables Plug-lock inserts strengthen the connection of any C14 plug-in device to any C13 outlet, keeping vital network equipment plugged in and running during routine rack access and maintenance Universal compatibility ensures proper fit and enhanced plug retention when used with any standard C14 plug and C13 outlet combination; no proprietary cables or outlets required