Octagonal box extension ring 4 in. diameter x 1/2 in. deep 5.0 cu in.

Octagonal box extension ring 4 in. diameter x 1/2 in. deep, 5.0 cubic in. Concentrics knockouts. To extend an existing octagonal box Mount with screws directly on the original box Adds volume Cubic capacity: 5.0 cu. in. 1/2 in. deep 4 in. diameter