Based on this product's specifications, here are some alternatives and similar models
Multi-reducer Coupling AKCES for Pipes Ø50/40/32 mm, Length 350 mm
Summary description:
AKCES multi-reducer coupling for pipe connections accepts diameters Ø50, Ø40 and Ø32 mm and has a length of 350 mm. Designed to join or adapt different pipe sizes in ventilation, drainage or plumbing systems, it provides a single-piece transition between compatible circular ducts or pipes. Suitable for retrofit, repair and system extensions where sequential reduction is required.