Explosionproof, dust-ignition proof|Malleable iron bodies have high tensile strength and ductility|Provides great resistance to corrosion, impact and shock|Accurately tapped, tapered hub threads for tight, rigid joints and ground continuity|Furnished with covers|General purpose wiring|Universal design with four threaded universal hubs and three close-up plugs|Serve as mounting outlets for lighting fixtures when used with hub cover|Wide, accurately ground explosionproof mating surfaces|Smooth, rounded integral bushing in each hub type box protects conductor insulation|(4) side hub location|Round shape|Complies with a wide range of classified area requirements|Corrosion resistant|For pulling of wires|Connect conduit lengths and change direction of conduit runs|Provide access for maintece|Triple coat of zinc electroplate, chromate and epoxy powder coated finish