Conduit Expansion Fitting, Type Expansion, Trade Size 2-1/2 Inch, Diameter 4-5/8 Inch, Length 13-1/4 Inch, Maximum Movement 8 Inch, Constructional Feature Weatherproof, Material Hot-Dip Galvanized Malleable/Ductile Iron Head, Phenolic Insulating Bushing, Steel Sleeve, Approval UL 514, CSA C22.2, Used On Rigid Metal Conduit/IMC, Applicable Standard Federal Specification W-F-408E, NEMA FB-1