Based on this product's specifications, here are some alternatives and similar models
Angle radiator union Fitting SF63-1 with 1 O-ring (Śrubunek grzejnikowy kątowy)
Summary description:
Angle radiator union Fitting SF63-1 is a plumbing fitting designed for radiator connections, featuring one O-ring seal for leak resistance. Intended for use in heating systems to join radiator valves and pipework at an angle, it simplifies installation and provides a compact sealed connection. Suitable for residential and commercial heating assemblies.