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HUBBELL Extension Ring, 12 Knockouts, (12) 1/2 Inch Side Knockout, 4 Inch Length, 4 Inch Width, 1-1/2 Inch Depth, Square, 22.5 cu-Inch, Drawn Steel, Silver, Pre-Galvanized
| Number of Knockouts | : | 12 |
| Knockout Size | : | (12) 1/2 Inch Side |
| Length | : | 4 Inch |
| Width | : | 4 Inch |
| Depth | : | 1-1/2 Inch |
| Shape | : | Square |
| Nominal Capacity | : | 22.5 cu-Inch |
| Material | : | Drawn Steel |
| Color | : | Silver |
| Finish | : | Pre-Galvanized |
| Warranty | : | 1 Year on Material and Workmanship |
- Combination screw heads provide for faster installation
- Acceptable for use in 2 hr rated walls
Standard/Approvals: UL 514-A File E195978
Application: For adding cubic capacity or as an outlet box for surface conduit
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