GR Type Conduit Outlet Box, Explosion-Proof, Dust-Ignitionproof, Malleable Iron, Unilet, GRL Hub Type. Includes: Internal Ground Screw and O-Ring, Internally Threaded Surface Cover with 3.38 Inch Opening, 18.0 Cubic Inches and (2) 3/4 Inch Threaded Hubs. For Use with Threaded Metal Conduit.
- Material: Malleable Iron
- Diameter: 3/4 in
- Cubic Inches: 18 in³