e46 M - what is this part?

[gaz1234]

its a circular rubber thing about inch in diameter at the rear under the wheel arch....?

[jaedba2604]

think it's a bung to fill a hole..might be wrong.

[gaz1234]

Hmm, will see if it will come out....

[belleair302]

Drainage point??

[TEKNOPUG]

Sill drain

[gaz1234]

its in the middle of the arch..

[TEKNOPUG]

Does it come out?

I have an E36 so probably not helping much

[Leins]

Is there one in exactly the same place on the other side? If not, could have been where someone has drilled through the lining so as to push out a dent in the wing, then put a bung back in to fill it