Unknown Rubber plug

[Peteb1951]

I found this under the front n/s seat of my 2020 b9.5. It's approx dia is 35mm. Does anyone know where it's from? (Only recent work was I had a towbar fitted a couple of months ago)

Edited June 30 by Peteb1951
Added fresh information

[Magnet]

Hello Peter,

It’s a blanking grommet which has probably been removed and replaced with holed grommet to allow some wiring to pass through. Seems reasonable to believe it was removed and substituted during wiring for the tow bar. 
Hope this helps. 
Kind regards,

Gareth. 

[Peteb1951]

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