HTS 8547: Insulating fittings for electrical machines, appliances or equipment, being fittings wholly of insulating material apart from any minor components of metal (for example, threaded sockets) incorporated during molding solely for the purposes of assembly, other than insulators of heading 8546; electrical conduit tubing and joints therefor, of base metal lined with insulating material

4 codes. Pick one to see its duty from every country of origin. From the USITC schedule, Revision 20 (2026).