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Dispositivo acoplatubos caracterizado por el hecho de constar de tres piezas esenciales de las cuales una de ellas es un núcleo central al que se acoplan por cada uno de sus extremos a rosca las otras dos intercalando juntas estancas que hacen asiento en las piezas extremas y que al comprimirse longitudinal y radialmente sujetan los extremos de los tubos a acoplar.