Does the ECT sensor have o ring

Hi, I can't tell for sure, but it looks like the ECT sensor by the thermostat has a rubber o-ring, and the one at the radiator might be metal. But it could also be a rubber o-ring. They are both called "o-ring" in the workshop manual, which leads me to think rubber. Even in the parts catalog, it just says "o-ring". I'm guessing rubber.