Based on this product's specifications, here are some alternatives and similar models
Brass tin-plated press-fit reducing tee Comap MultiSkin 16x20x16
Summary description:
Press-fit reducing tee Comap MultiSkin in tin-plated brass with dimensions 16x20x16 mm. Designed for use in plumbing and heating systems where a change of pipe diameter is needed; enables a 20 mm main line to branch to 16 mm connections. Suitable for multilayer and metal-plastic piping compatible with press-fit installation, offering a compact, durable mechanical connection for water distribution and heating circuits.