WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.
0491382 168010 Adapter MW
NOTE:
For connecting the workshop compressed air supply to the CNG system via the CNG filling connection. [Discontinued]