The Cooper Wiring Devices L1430P 30-Amp 125/250-Volt Hart-Lock Industrial Grade Plug with Safety Grip is designed and built with superior materials for long-lasting performance. It is used for 20-amp 125/250-volt with a NEMA L14-30R. NEMA provides a forum for the standardization and testing of electrical equipment, enabling consumers to select from a range of safe, effective, and compatible electronics. Its ribbed nylon construction is rugged and durable for dependable use. It features multiple-head screws for flexibility in the installation and ease of use. It has neoprene gasket seals around the cord for added terminal protection from external elements. The cord grip inserts accommodate a wide range of cord diameter. It features serrated terminal plates and contoured terminal clamp "bites" on the conductors for positive termination. Tapered, individual wire pockets guide wire into contact area for ease of termination. Clear terminal cover allows for easy inspection of conductors and terminations. Cooper Wiring Devices is committed to providing products that increase productivity, energy efficiency, safety at work and in the home, and produce reliable performance. Whether a home-Feets style is traditional, modern, casual, cozy or rustic, it will demand more from wiring devices than in years past. Cooper Wiring Devices is dedicated to providing the up-to-date wiring device solutions that today-Feets homes need.