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.
- Material: Malleable Iron
- Diameter: 1 1/4 in
- Cubic Inches: 31 in³
- Hub Diameter: 3/4 in
- Number of Hubs: 3