Knockout Seals & Plugs

We carry a complete selection of knockout seals to fit any size electrical enclosure box. Whether your project requires weatherproof knockout seals or interior-rated plugs, we have a product that fits the bill. In sizes ranging from 1/2 inch to 4 inches, we stock knockout seals and plugs constructed of zinc, steel, plastic and neoprene to fit most plastic, fiberglass and metal enclosures. Shop knock out seals from Arlington Industries, Cully/Mineralac, Eaton/Crouse Hinds, Mulbery Metal Products, and Thomas & Betts. View our complete selection of knockout plugs online or stop by one of our local stores to speak to an expert.