OZ-Gedney Type IB Non-Grounding Insulating Bushing, Size: 4 IN, Polypropylene, Gray, Connection: Threaded, 105 DEG C, 5-1/8 IN Maximum Diameter, 7/8 IN Maximum Height, Third Party Certification: UL File Number E-11853, CSA 057250, Applicable Third Party Standards: UL 514B, CSA C22.2 No.18, Federal Specification W-F-408E, For Threaded Rigid Conduit And IMC