What should be in this hole?

[Don 130]

As above, I saw the hole in the front cover of the engine today. It looks like something is missing from there. A grommet or something?

194007

Don.

[DazzaTD5]

a rubber bung thing...

[Don 130]

Thanks Dazza, I thought it might be something like that, but hadn't noticed it till it was gone.
Don.