Most Westfalia campers are equipped with a side window whose original glass has been replaced by a louvred side window. It can be opened from the inside to eliminate cooking odours and to provide the necessary ventilation of the interior.
The rubber used to mount this window in the groove is not the same as that of the standard window, the rubber is much thinner and has a different profile.
At first, one would expect the Westfalia to choose a black rubber like any other window rubber. But they looked at the aluminium side window; black would offer too much contrast, so the factory opted for grey.
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