EATON L1420C 20-Amp 125/250-Volt Hart-Lock Industrial Grade Connector with Safety Grip, Black and White Used for 20-amp 125/250-volt with a NEMA L14-20R Features multiple-head screws for flexibility in the installation and ease of use Has neoprene gasket seals around the cord for added terminal protection from external elements Cord grip inserts accommodate a wide range of cord diameter Its ribbed nylon construction is rugged and durable for dependable use