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Junta hermética perfeccionada aplicable especialmente a clavos o tornillos de sujeción de placas de fibrocemento caracterizada esencialmente por estar constituida mediante una arandela cónica en cuya superficie lateral interior presenta acoplada una faldilla de naturaleza metálica maleable prolongada en un cuello cilíndrico que pasa a través de la arandela estando unida dicha faldilla a la arandela por un pegamento convencional.