I see what you refer too and it is part of the tank molding , However if it has a hole through into the the tank and coolant is leaking from it , Then I'm afraid you are in need of a new expansion tankIt should be blank.
Too dark now for me to get a pic for you.
Cheers


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It should be blank.
However I did find a pic of the bottom of a tank on good 'ol EvilBay




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