FD single-gang cast device box with corrosion-resistant ideal for indoor and outdoor installations. Weatherproof, raintight and dust-tight when used with cast gasketed covers. Malleable iron for high tensile strength and ductility provides greater resistance to impact and shock. They have ridge top construction for positive cover/gasket/box fit. Accurately tapped, tapered threads for tight, rigid joints, ground continuity. UNILETS® for use with threaded rigid conduit and IMC.