Hooker Electric offers a gray 1-Gang FD (deep) weatherproof box has two 3/4″ (19.1) I.P.S. molded-in knockouts. Marine-Rated Back Boxes. Devices have nickel-plated brass components and heat-resistant interiors to withstand chemical and harsh marine environments. Molded ridge around face further prevents water from getting between box and cover plate. Accepts 15A, 20A, 30A & 50A receptacles. 4.56″ H x 2.94″ W x 3.13″ D and has 22 cubic inch capacity.