This AC WORKS brand heavy‑duty wiring device features a NEMA L21‑20P 20‑amp 3‑phase 120/208‑volt locking power inlet designed for industrial, commercial, and large‑venue power distribution. Commonly used for convention centers, event infrastructure, and high‑demand temporary power, this inlet provides a secure and durable connection point for 3‑phase systems requiring a locking configuration.The inlet supports up to 7,200 watts and incorporates a 5‑wire (4‑pole, 5‑wire) design suitable for balanced 3‑phase loads. Built with impact‑resistant, chemical‑resistant, and weather‑resistant construction, it withstands demanding environments. It is compatible with 12 AWG or 10 AWG copper wire and above, and installs using mounting holes requiring a saw size between 2.10″ (53.34 mm) and 2.30″ (58.42 mm).This unit conforms to cULus E237606 and includes #2 size screws for installation. DIY products include a 1‑year limited warranty.