IMC/Rigid Conduit Coupling; Type 3-Piece, Threaded; Trade Size 3-1/2 Inch; Diameter 5-1/4 Inch; Length 3-5/8 Inch; Material Zinc Electroplated Malleable Iron; Constructional Feature Concrete-Tight; Standard Package 4; Approval UL 514B, UL (Canada and US), CSA; Used On IMC/Rigid Conduit; ROHS Compatible; Applicable Standard Federal Specification A-A-50553, NEMA FB-1