Etl Listed, Starelo 30 Amp Locking Female Plug Box Nema L14-30C Generator, Etc. Specifications: NEMA L14-30C, one Locking Female Plug with protective box. Parameters: ETL Listed, 125/250V, 30A, 3 Pole 4 Wire Grounding Type.Protection class: IP66. Attention?The reserved thread on the product is metric thread,if you needed,it can achieve IP66 protection level with the M25/M32 metric waterproof connector in the STARELO store. Design: The socket comes with a protective box, which is made of high-quality plastic. When not working, cover the cover to prevent dust from entering, reduce the damage caused by radiation to the human body, and have waterproof function. Applicability: Use with generator transfer switch,Used for the connection of generators or welding machines.