IMC/Rigid Conduit Coupling; Type Compression; Trade Size 3-1/2 Inch; Diameter 2-1/4 Inch; Length 5 Inch; Material Zinc Plated Malleable Iron; Constructional Feature Concrete-Tight; Standard Package 6; Approval UL 514B, UL (Canada and US); Used On IMC/Rigid Conduit; ROHS Compatible; Applicable Standard Federal Specification A-A-50553, NEMA FB-1