Appleton ER Conduit Outlet Boxes for use with Rigid Steel, Rigid Aluminum and IMC Conduit where Explosionproof, Dust-Ignitionproof are required. Corrosion-resistant ideal indoor or outdoor. Connect conduit lengths and change direction of conduit. Malleable iron bodies have high tensile strength and ductility. Provides great resistance to corrosion, impact, and shock. Furnished with cast covers. Compact, rectangular conduit outlet boxes are ideal in classified locations where space is limited. Six different hub arrangements.