Filler cap, aluminum, after-market (gasket included) ►see details

Comparison with original BMW cap:

- lower weight: 88 grams vs. 126 grams

- without brand vs. Blau - Austria

- Viton seal ring vs. cork seal ring and extra Viton seal ring

- both have a partially knurled outer edge, but on the after-market fuel cap this is on the bottom while on the original fuel cap it is on the top