Based on this product's specifications, here are some alternatives and similar models
Compression reducing coupling AKA PE J-68 40 x 32 mm
Summary description:
Reducing compression coupling AKA PE J-68 for polyethylene (PE) pipes, size 40 x 32 mm. Mechanical fitting designed to join pipes of different diameters using threaded/compression ends and seals for leak-resistant connections. Suitable for water supply, irrigation and underground PE pipeline repairs and extensions where a transition from 40 mm to 32 mm pipe is required.