TRV/Thermostat Radiator ValveADAPTOR FOR Danfoss 25mm "RAVL" Model ONLY. Suitable for older, pre 1999 radiator Valves with the now Obsolete 25mm Clamp, Pushfit, or Clip-On fitting, and this then Converts it to the Modern 2025 Standard 30mm/M30 Ring-Screw fitting.
eBay