TRADIZIONALI Flues: AISI 316L BA stainless steel single-wall flues (thickness 0.5 mm) produced in diameters of 350 – 600 mm included. These flues are characterized by the traditional type of couplings i.e. smooth. To achieve stability of the joints, after having put the “male/female” couplings together, special locking clamps must be used. The sealing gasket is pre-inserted in all “male” type couplings.