Based on this product's specifications, here are some alternatives and similar models
Compression straight coupling Comap 20 mm x 1/2" external thread (9460514-02)
Summary description:
Straight compression coupling by Comap with 20 mm tube connection and 1/2" external (male) thread. Designed to join a 20 mm pipe to a threaded 1/2" fitting, it suits plumbing and heating installations where a compact, threaded transition is needed. Model MPN 9460514-02 provides a reliable mechanical seal for potable water and heating circuits.