IMC/Rigid Conduit Reducing Bushing, Type Threaded Hex Head Shoulder, Large End Trade Size 4 Inch, Small End Trade Size 3-1/2 Inch, Size 5-3/8 Inch Dia, Material Zinc Plated Malleable Iron, Approval UL 514B, CSA C22.2, Used On Rigid Conduit/IMC, Applicable Standard Federal Specification W-F-408E, NEMA FB-1, Width Across Corner 5-3/8 Inch
