and the plug like member 74 along with an electrical feed through 82 and an elongated elements 26 penetrates deposit 80 and plug like member 76 in this regard an axial bore 84 86 are defined within plug like member 74 for penetration of electrical feed through 82 and the second elongated element 28 an axial bore 88 is provided within plug like member 76 for penetration of the elongated element 26 in order to install plug like members 74 76 within the end of tubular membrane elements 14 16 the same is fabricated with a larger outer diameter than the inner diameter of tubular membrane elements 14 16 and then cooled with liquid nitrogen the percentage difference in diameters can be about 10 percent thereafter plug like members 74 76 are installed in the ends of tubular membrane elements 14 16 and as such members warm to ambient temperature the same expands to produce a seal within the ends of tubular membrane element 14 16 additionally each of the bores 84 86 88 are all sized smaller than the associated electrical feed through 82 and the elongated elements 28 26 after installation and warming of the plug like members 74 76 the.