The disclosure relates to a flexible airtight stranded wire for electrical interconnection between chambers wherein it is necessary that gases do not travel between chambers. The wire is formed from standard stranded wire, a short length of stranded or unstranded wire is tightly wound around one section of the wire and the wound length of wire is soldered to the stranded wire the solder passing into and entirely across the stranded wire to provide a gas tight seal therethrough. The soldered wire is then placed in a mold and stretched whereupon insulation is molded thereon, the area over the wound length of wire and solder having a greater cross-section than the remainder of the wire. The wire is secured in a bulkhead, the insulation making an airtight seal therewith.