Arlington Floor Box, Leveling Ring for new Concrete Floors
Arlington’s new FLBC4502 4.5″ non-metallic concrete floor box has six conduit hubs and four plugs.
And the new reversible FLBC4502LR leveling ring makes installing any 6” cover easier than ever on any 4.5” concrete box..
The screw holes on one side have a 3-1/2″ hole pattern. On the other side it’s 3-3/8″.
http://www.aifittings.com/landing/flbc4502/