embodiment is manufactured by fixing the conductive components in an injection molding machine and injecting a high temperature high strength thermoplastic into the equidistant cavity formed between the threads a suitably high temperature is required in the molding process in order that the injectant remains able to beneficially flow and completely fill the cavity between the male and female components once filled a holding pressure typically u02dc 20 000 psi is maintained until the thermoplastic solidifies in certain oil and gas drilling applications this procedure forms a tight seal against penetration of potentially conductive drilling fluids into the gap sub assembly as well as prevents the adjacent conductive components of the gap sub assembly from rotating relative to each other anti rotation i e torsion resistance is provided by means which require parts of the dielectric material to shear in order to disassemble the threaded section under torsion loading in the embodiments shown in fig3 to 8 such means are provided by an elongated barrier of dielectric material protruding from the electrical isolator component and formed by elongated u201c grooves u201d or u201c slots u201d in the surfaces of one or both of the male and female conductive components fig9 to 11 show alternative anti rotation means namely embossments on the electrical isolator component formed by drill holes dimples and a reverse thread in one or.