Main coolant hose seal?

[TheChosenOne]

What is the gasket or seal called that is in between that metal rear coolant hose and the thermostat housing? I went to Autozone, and they didn't have a reference name for anything. Any help would be appreciated.

This is where it should be \/ \/ \/
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[TheChosenOne]

I fail. I think it's called the water pipe O-ring, and the reason i couldn't find it is because AutoZone doesn't carry it.

[blazenem]

if you got a napa near you try there they usually have stuff that autozone and the other dont