Cover round 4" one 3/4" openings aluminium

Round boxes and covers are designed to accept a variety of standard electrical equipment including photocontrols and arm mounted lighting fixtures. Heavy-duty die-cast aluminum or zinc. All holes are tapped 1/2. or 3/4. NPS. Close-up plugs are included with each box (1 less than the number of holes/box). Universal style boxes are equipped with .secured. die-cast lugs for mounting to any surface: wood, cement, or brick.