Based on this product's specifications, here are some alternatives and similar models
Trójnik zaprasowany 16×20×16 mm No name MT162016 — miedziany łącznik instalacyjny
Summary description:
Press-fit tee (trójnik) No name MT162016 with dimensions 16×20×16 mm for plumbing and heating installations. A press-connection copper fitting designed to join three pipes of the specified diameters. Suitable for potable water, central heating and radiator circuits, it provides a reliable sealed joint when installed with compatible press tools and seals. Practical for repairs and new builds.