Threaded Coupling – Three-Piece, Iron, Trade Size 3 1/2 in, Overall Length 3 15/16 in, Finish Zinc Plated, Insulated No, Compatible Conduit Type RMC, Thread Size 3 1/2 In.-8, Thread Type NPT, Thread Gender Female, Elbow Angle Not Applicable, Conduit Fitting Type Coupling, Standards cUL Listed, Federal Specification Number A-A-50553, LEED, NEMA FB-1, REACH Compliance, RoHS Compliant, UL File Number E9391, UL Standard UL-514B, For Use With Threaded Rigid Conduit