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.
0495257 645105 Adapter MW
NOTE:
(Filling adapter) For closing off the pressure line and connection to connecting hose (has replaced special tool 64 5 101 since 01/2005) [Discontinued]