Tru-Link Locking 515LR Female Connector #515LR Leviton 515LR 3 wire polarized 15a 125v Tre-Link Locking Female Connector UL Cord Range : 18-3 / 12-3 (0.240-0.655) Locking mechanism on these devices automatically secures a mating straight blade plug , the RD easy-release tab disconnects the plug