& Bentley THERMOSTAT EXTRACTOR (RH639). This is a genuine. Rolls Royce & Bentley. Extraction tool for the thermostat on all cars from 1946 to 1965. Thermostats RH9143 and UE30193 have been. Manufactured without the threaded 3BA. Holes to accept the original extraction tool RH639. Be bought separately and fits over the top of the thermostat and allows it to. Be extracted if the thermostat does not have the threaded holes. Check out my other Items – they may be of interest!