Based on this product's specifications, here are some alternatives and similar models
Safety Relief Valve FLAMCO PRESCOR 3/4" x 1" Thread 3 bar (model 27024)
Summary description:
FLAMCO PRESCOR safety relief valve model 27024 is a pressure relief device with 3/4" x 1" threaded connections and a set opening pressure of 3 bar. Designed to protect closed heating and hot-water systems from overpressure, it provides reliable automatic pressure release. Suitable for residential and light commercial boiler and circulation installations where regulated overpressure protection is required.