GR Type Conduit Outlet Box Explosion-Proof Dust-Ignitionproof Malleable Iron Unilet GRX Hub Type. Includes: Internal Ground Screw and O-Ring Internally Threaded Surface Cover with 3.88" Opening 18 Cubic Inches and (4) 1/2" Threaded Hubs. For use with Threa
GR Type Conduit Outlet Box Explosion-Proof Dust-Ignitionproof Malleable Iron Unilet GRX Hub Type. Includes: Internal Ground Screw and O-Ring Internally Threaded Surface Cover with 3.88″ Opening 18 Cubic Inches and (4) 1/2″ Threaded Hubs. For use with Threaded Metal Conduit.Material: Malleable IronDiameter: 1/2 inCubic Inches: 18 in
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