Based on this product's specifications, here are some alternatives and similar models
Transition fitting Unidelta PE female threaded 40 mm x 1" (601639)
Summary description:
Unidelta transition fitting made of PE with a female 1" threaded connection and 40 mm socket end. Designed to join polyethylene pipe to a 1" threaded metal or plastic fitting, it provides a secure mechanical and leak-resistant connection for water supply, irrigation and plumbing systems. Suitable for installation in household and light commercial piping.