Lamson CEILING BOX

PVC 4" diameter x 2-1/4" D., 20 cu. in. For use in new construction. 3/0-4/0 combination ceiling box with captive nails, 6 integral clamps and fixture spacing for 2-3/4" - 3-1/2". UL listed. No. B520AUPC: Box No. B520PRUPC: Box with grounding lug and screw