Rigid Conduit Hub, Type Tapered Threaded, Throat Type Insulated, Trade Size 3-1/2 Inch, Size 4.81 Inch Dia x 3.19 Inch L, Constructional Feature Flame Resistant, Ground Type Locking Edge of Body, Material Zinc Electroplated Dichromate Dip Aluminum Polymer Enameled Malleable Iron Body, Neoprene Gasket, Approval UL, CSA, Used On Rigid Conduit, Application Suitable for Service Entrance, General Purpose Fitting