<p>End plug of an electric heating element formed by a sleeve enclosing an element which is embedded in an insulating layer is formed by a synthetic resin and its viscosity during its formation is adjusted such that a portion of the resin mixture penetrates the interface portion of the insulating layer. Plug provides permanent weather-proof connection. The resistance of the insulation is >=104 megaohms and the flashover strength is >=2.5 kV.</p>
