WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.
0495258 645106 Adapter MW
NOTE:
(Sealing adapter) Sealing adapter for closing off the line for the leakage test (included in delivery specification from 01/2005) [Discontinued]