Based on this product's specifications, here are some alternatives and similar models
Pipe end cap Supratherm 20 mm model 2204050 for PP-R plumbing systems
Summary description:
Supratherm PP‑R pipe end cap, 20 mm (model 2204050), designed to close and seal the end of polypropylene random copolymer plumbing pipes. Suitable for use in potable water and heating installations that use PP‑R tubing. Provides a durable, leak‑resistant termination for pipe runs and temporary or permanent closures during installation and maintenance.