Leviton 2511 20 Amp, 120/208 Volt 3PY, NEMA L21-20P, 4P, 5W, Locking Plug, Industrial Grade, Grounding - Black-White Super Tough Nylon Body Resists Damage From Severe Impact, Abrasion and Chemicals NEMA and Non-NEMA Configurations Available Solid Brass Blades And Contacts Feature Improved Conductivity, Low Resistance, Low Heat, and Long Life Internal Wiring Chambers Isolate Individual Conductors to Prevent Flashover, Arcing, and Stray Strands of Wire Nylon face module features Amperage, Voltage, and NEMA configuration molded into face for easy identification and replacement