Based on this product's specifications, here are some alternatives and similar models
AGAflex pipe fitting IK coupling 1/2" female thread (model 10020001)
Summary description:
AGAflex IK coupling with 1/2" female (internal) thread, model 10020001. A metal pipe fitting designed to join and secure 1/2" threaded pipe ends in plumbing and heating systems. Features a standard IK coupling design for reliable mechanical connection and leak-resistant jointing where threaded connections are required. Suitable for residential and light commercial installations.