Thread: what type of seal on TD5 Head water plug?

Hi folks

Well tonight finally tracked down a small coolant leak appearing under the new exhaust gasket between 3 and 4. I see it must be coming from that hex type 1 inch bung into the head and when looking at a new picture of these plugs online, it just shows a fine threat and nothing else. I have to pull it out but just checking for advice on what type of seal they use use or dare I say, pull me plumbers tape out??

Oops, just searched core plug and all good, another weekend project coming up.