Arlington Industries' FLBC4502 4.5-in. Nonmetallic Concrete Floor Box
Arlington Industries' FLBC4502 4.5-in. nonmetallic concrete floor box has six conduit hubs and four plugs. The reversible FLBC4502LR leveling ring can install any 6-in. cover on any 41/2-in. concrete box. Side A fits any 6-in. round cover with a 31/2-in. screw hole pattern. Side B has a second set of holes that fit 6-in. covers with a 33/8-in. screw hole pattern.