Based on this product's specifications, here are some alternatives and similar models
Reducer coupling Detal-met 25 x 20 PP-R, pipe fitting for polypropylene plumbing systems
Summary description:
Reducer coupling Detal-met 25 x 20 PP-R is a polypropylene (PP-R) pipe fitting designed to connect a 25 mm pipe to a 20 mm pipe. It provides a secure transition between different diameters in plumbing and heating installations, compatible with PP-R systems and suitable for potable water and heating circuits where PP-R fittings are used.