transition element between the heating appliance and the flue system. Designed for installation on the heating unit's pipe to convert from a "smoke" flue system to a "condensate" system. Made of AISI 430 stainless steel with a wall thickness of 0.8 mm. Cold-formed socket joint with ideal geometry and gas tightness. Laser butt welding ensures a thin and durable seam, significantly increasing service life. Operating temperature up to 600°C.