If you own a BMW and that little fuel cap tether line has broken or gone missing, this replacement part will fix it right up. This is the OEM part number 16117222391, made from durable ABS plastic that should hold up better than the original. It fits a ton of BMW models including X3, X4, X5, X6, 1-Series, 3-Series, 5-Series, 7-Series, and Z4 from various years. The installation is straightforward - just attach it to your fuel door and cap the same way the original was set up. No more worrying about your gas cap dangling against your paint or worse, forgetting it on the roof of your car and driving off! The build quality feels solid, and it's a direct replacement that matches the factory specifications perfectly. At only 9 grams, it's lightweight but strong enough to do its job. If you're tired of holding your gas cap while fueling or have been dealing with a broken tether, this inexpensive part will restore your fueling experience to proper BMW standards. Definitely check your specific model year against the compatibility list to make sure it fits, but for most BMW owners, this is exactly what you need.