Shop for Electrical at The Home Depot. Extend your outdoor 2 gang electrical box with this UL Listed, weatherproof, extension ring. Made from corrosion resistant, diecast aluminum alloy, its durable powdercoat finish, is designed to withstand the elements, any season, rain or shine. It's easy to install, and comes with an instruction card, gasket, and mounting screws. Greenfield's high-quality, weatherproof electrical products are engineered for success to stand the test of time and make sure the job gets done right the first time. Greenfield Industries is widely recognized as the industry's leading USA manufacturer of weatherproof electrical products. That's why people who make a living working in the electrical field know and respect the Greenfield name. Greenfield, We Take Pride In What Others Take For Granted.