ribbon a tube etc which can be any conventional construction and is formed of an electrically conductive material e g a noble metal combination such as a mixed metal oxide mmo over titanium or platinum over niobium copper or any other conventional anode materials the cable 24 can also be of any conventional construction in the embodiment shown the cable 24 comprises a plurality of electrically conductive e g copper strands or filaments 24 a having an electrically insulating covering or coating 24 b e g kynar u00ae polyvinylidene fluoride thereon in accordance with one preferred aspect of this invention the sealing device 20 is molded in situ e g injection molded as will be described later with reference to fig4 about the electrical joint 26 connecting the anode 22 to the cable 24 to establish a waterproof insulation covering for the anode to cable connection in the exemplary embodiment shown the electrical connection between the anode 22 and the cable 24 at the joint 26 is effected by use of an electrically conductive crimp sleeve 28 to that end a portion of the insulation 24 a of the cable is removed at the point where the electrical connection is to be made this creates an open region 30 exposing the electrical strands or filaments 24 a a portion of the elongated anode 24 is disposed over the filaments 24 a in the region 30 and the crimp sleeve 28 is disposed thereabout the sleeve is then crimped in place to result in tightly compressing the underlying portion of the wire anode 22 into engagement with the strands 24 a of the cable as best seen in fig3.