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Flotador hueco que se caracteriza por el hecho de comprender un cuerpo tubular de testeros cerrados el cual está interiormente dotado de un tubo axial cuyos extremos desembocan en dichos testeros y a través del cual es susceptible de disponerse el elemento lineal sobre el que se monta el flotador estando la superficie externa de este último dotada de una ranura dispuesta helicoidalmente.