Based on this product's specifications, here are some alternatives and similar models
Security retaining ring Comap M30x1.5 for Comap valve head, anti-theft
Summary description:
Security retaining ring for Comap valve heads with thread M30x1.5. Designed to prevent unauthorized removal of the control head, it secures the thermostatic or control element to the valve body. Metal construction and compatible thread ensure reliable fixation for heating or cooling systems, maintenance access control, and protection in residential or commercial installations.