20 Amp NEMA Connector L1520 - Black Back, White Front Body, L1520C, Turnlok Connector 4wire 20amp 3phase 250v, • Quick-thread assembly screws and cord-grip screws come backed-out, ready-to-wire. , • Industrial-strength, brass alloy plug blades and connector contacts resist heat rise, provide excellent conductivity. , • Raised ribs provide non-slip gripping profile for turning to lock and unlock. , • Double dovetail design provides superior protection against cord pull-out forces. , • Impact- and corrosion-resistant durable nylon 6/6 shell material. , • Rounded back contour reduces snags and hang-ups on the job site. , • Scallop shell design provides non-slip gripping surface for insertion and withdrawal. , • Visible stamped NEMA configuration and device rating. , • New-design external cord grips provide visible assurance of safe and proper cord retention. , • Integral flexible rubber cord grommet conforms to and seals around SO cord to provide protection from oils, water, or chips entering wiring chamber.