Rigid Conduit Connector, Type Set Screw, Throat Type Insulated, Trade Size 2-1/2 Inch, Diameter 3-9/16 Inch, Length 2-1/8 Inch, Thread Length 1 Inch, Material Zinc Plated Malleable Iron, Constructional Feature Concrete-Tight, Approval UL 514B, Used On Rigid Conduit/IMC, Applicable Standard Federal Specification A-A-50553, ANSI/NEMA FB-1