Leviton 2421 20 Amp, 250 Volt 3-phase, NEMA L15-20P, 3P, 4W, 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 Deep slotted triple drive face module and cord clamp screws