Based on this product's specifications, here are some alternatives and similar models
Elbow 90° welded Modern PE-RT PE polyethylene 16x16 (sleeve) SiGMA-Li PERTK9016T
Summary description:
Welded 90° elbow for PE-RT/PE piping systems, SiGMA-Li model PERTK9016T with 16x16 mm dimensions and sleeve connection. Designed for directional changes in hot and cold water distribution and underfloor heating installations, the fitting provides a compact joint for polyethylene pipes compatible with PE-RT systems. Suitable for residential and light commercial plumbing.