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GR Type Conduit Outlet Box, Explosion-Proof, Dust-Ignitionproof, Malleable Iron, Unilet, GRT Hub Type. Includes: Internal Ground Screw and O-Ring, Internally Threaded Surface Cover with 3.94" Opening, 31 Cubic Inches and (3) 1-1/4" Threaded Hubs. For use with Threaded Metal Conduit.