From the Manufacturer

The Crouse-Hinds APJ10477 Arktite Heavy-Duty 100 Amp Circuit Breaking Plug With Cable Grip And Neoprene Bushing, 4-Wire/4-Pole is a circuit breaking, compressor, conveyor, motor generator set that is polarized. Also, it is corrosion resistant, dirt tight, dust tight and moisture resistant. The Crouse-Hinds AP20467 Arktite 200 Amp Heavy-Duty Circuit Breaking Receptacle Housing Mating Plug is weather proofed and is made from copper-free aluminum. It can be used in areas such as chemical plants, heating and cooling units, lighting systems, manufacturing plants, meat packing plants and process industries. This product includes the cable grip and the neoprene bushing. From the modest upstate New York beginnings in 1897, Crouse-Hinds has grown into a worldwide organization that manufactures or markets products on every continent. Through aggressive leadership in product innovation, engineering, manufacturing, distribution and technical support we have quite literally, set the standards by which other manufactures in our industry are measured.