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Fuelle desatrancador perfeccionado, caracterizado esencialmente porque está constituido por una campana cilíndrica, cuya superficie lateral presenta periféricamente una serie de expansiones semitóricas huecas, escasamente distanciadas, en tanto que su borde esta abocardado; de modo que dichas expansiones tóricas facultan al cuerpo de la campana de elasticidad de compresión o aspiración al oprimir y soltar respectivamente su extremo superior cerrado.