Hubbell-Bell 5403-0 Weatherproof Box Extension Adapter, 5-1/4-Inch X 3-1/2-Inch State of the art powder coat finish provides maximum weather ability and scratch resistance Rugged die cast aluminum construction Internal hub threads comply with NEMA requirements and will accept all threaded fittings and threaded conduit Reinforced connector outlets One 3/4 In closure plug, installation hardware, gasket, and ground screw included