Suitable for our NT 80/1 B1 M, NT 80/1 B1 M S and NT 75/1 Me Ec H Z22 safety vacuum cleaners: the unique DN 40 chrome-plated metal bend. The bend is equipped with a threaded ring at the hose end, for secure fastening to the appropriate special suction hose, while at the accessory end, a union nut enables a firm connection to the special suction tube or respective suction nozzle.