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GR Type Conduit Outlet Box, Explosion-Proof, Dust-Ignitionproof, Malleable Iron, Unilet, GRC Hub Type. Includes: Internal Ground Screw and O-Ring, Internally Threaded Surface Cover with 3.38" Opening, 18 Cubic Inches and (2) 3/4" Threaded Hubs. For use with Threaded Metal Conduit.