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Prensaestopas perfeccionado, caracterizado por el hecho de estar constituido por un casquillo cilíndrico en cuyo interior comprende un núcleo elástico retenido por dos arandelas en escuadra, cuyo núcleo está formado por un muelle helicoidal recubierto por una funda de material elástico que abarca su parte lateral y se dobla por sus caras superior e inferior circundándole.