OZ-Gedney Type 4 Three Piece Coupling, Trade Size: 3-1/2 IN, 5-1/8 IN Outside Diameter, Length: 3-1/2 IN, Flexibility: RMC And IMC, Malleable Iron, Connection: Threaded, Third Party Certification: UL File Number E-11853, CSA 009795, Applicable Third Party Standards: UL 514B, CSA C22.2 No.18, Federal Specification Number/CID A-A-50563, ANSI/NEMA : FB-1, For Rigid Conduit And IMC