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Tuerca protectora, esencialmente constituida por un cuerpo anular dotado exteriormente de generatrices abultadas y bajo ellas de una expansión anular cuyo borde básico constituye el asiento de apoyo de la tuerca, estando la misma roscada interiormente en su zona media y presentando hacia el borde libre un escalón del mismo grueso del tubo con el que opera e inclinado hacia el citado borde formando boquilla protectora de diámetro creciente hacia el extremo de salida.