Insulation cap used in the unión and fixing rails traviesas, characterized in that it consists of plastic molding and comprises a tubular body having an end widening to define a wing perimetral plane encountering dotado the tubular body of a cone-headed end widening concava generatrix; and why the underside of ala emerge at least two straight outgoing surmounting their free ends in thickened portions which are close to the upper end of the expansion, so that these projections are flexible behavior for receiving a washer is positioned and retained between said projections. (Machine-translation by Google Translate, not legally binding)
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