Thus, as shown in FIG. 6, conductor pin 28 extends through and is held and sealed in the insulator and seal structure 30, the portion of pin 28 within casing 12 is formed into a right angle bend as shown in FIGS. 2 and 3 and is snugly fitted into one end of a coupling sleeve 142 which, in turn, is secured such as by welding to the intermediate lead 108.