Flexible elbow of 90 ° to realize junctions of the pipeline. Made of elastomer. It contains metallic interior wharf of reinforcement. Terminuses in red ABS of 25 cm. Of diameter. Designed specifically to realize junctions curled of 90 ° of the network of pipeline of the systems of detection of smoke for aspiration, in those facilities that could need flexibility to compensate structural movements and / or expansions of the network of pipeline of aspiration.