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 3.38" Opening, 18 Cubic Inches and (3) 1/2" Threaded Hubs. For use with Threaded Metal Conduit.
- Material: Malleable Iron
- Diameter: 1/2 in
- Cubic Inches: 18 in³
- Number of Hubs: 3
- Hub Diameter: 1 1/2 in