I currently have coolant fluid leaking from a recessed bolt of some sort on the driver side on my cylinder head on my 2008 Mazda 3i 2.0L. I have searched and search but cant seem to find any reference to this "plug". I was thinking it was a freeze plug of sorts but it is threaded with a hex head of some sort. Attached is a picture i was able to find of it(it is the rusty recessed plug in the picture), any help identifying this part would be useful!
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