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Close off any unused knockout hole in your outdoor electrical box with these UL Listed, weatherproof, closure plugs. Each closure plug, is made from corrosion resistant, diecast zamak alloy. When installed with a silicon or equivalent sealing compound, it is designed to withstand the elements, any season, rain or shine. 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.