Fss Shallow Depth 1-Gang Cast Device Box | Control Circuits Lighting Ballasts Meter Circuits Electronic Circuits | Designed to Compensate for Length Changes Due to Temperature Variations in Exposed Conduit Runs | For Reducing Conduit Entries to a Smaller Size in Threaded Rigid and Imc Conduit Systems | For Use With Schedule 40 and 80 Conduit | For Use With Threaded Metal Conduit and Imc