NEMA L21-20P Locking Plug Connector for Generator, Twist Lock Male Plug, 20 Amp, 120/208 Volt, 4 Pole, 5 Wire Grounding, Industrial Grade Heavy Duty, UL Listed, Black

66600-BK Industrial Grade 20A 120/208V Locking Plug Device: NEMA L21-20P, 60Hz, 4P, 5W grounding. Made with high impact polycarbonate thermoplastic construction with solid brass blades fitted to ensure locks are securely in place. Use in combination with locking connector 66601-BK, NEMA L21-20C. UL-Listed, 1-Year Warranty. This insert helps maintain a clean and safe environment by preventing dust accumulation and electrical exposure. Made from high-quality thermoplastic, it resists impacts and offers a long-lasting finish suitable for both residential and commercial applications.