4″ x 1-1/2″ deep, square, steel extension ring, 12 each 1/2″ Knockouts, 22-1/2 CUIN.
- Made of pre-galvanized steel
- With proper fitting can be used for Conduit, NMSC, Armored, Metal Clad, Flex cable
- 22.5 cu. in. capacity
- Acceptable for use in two hour fire rated wall
- The product is UL Listed