Explosionproof Conduit Outlet Box, Hub Size 3/4 Inch, Hub Type External, Number of Hubs 4, Capacity 21 Cu Inch, Shape Round, Number of Plugs 3, Cover Type Blank, Cover Opening Diameter 3.81 Inch, Enclosure Class I Div 1 and 2 Group C D, Zone 1 and 2 IIB, Class II Div 1 and 2 Group E F G, Class III, NEMA 3, Material Zinc Electroplated Chromate Epoxy Powder Coated Malleable Iron, Approval CSA C22.2, Includes (4) Threaded Universal 3/4 Inch Hub, (4) 3/4 to 1/2 Inch Reducer, (3) 1/2 Inch Close up Plug, Application General Purpose Wiring, Pulling of Wires, Connect Conduit Lengths and Change Direction of Conduit Runs, Provide Access for Maintenance