For those of you who have the late model water filler (the one that uses the plastic key on the door of the filler) we have developed a thin metal replacement key.  It is universal for all the late model fillers that are hinged at the bottom.  This key is flat steel and much less bulky than the original plastic key and fits comfortably on your keyring taking up little space.
 
Please note that if you have the older style filler with the locking cap that is accessed by raising the exterior flap, this key will not work.  There are 34 different key possibilities for that lock.  We can, however make a key for that system.
 
Feel free to contact me for more information at vwcarlocks@hotmail.com.  We have only manufactured a very limited number of these, but if there is sufficient interest we can machine another run.  
 
Thanks!
Steve Sandlin, Registered Locksmith
Steve's Lock Shoppe
www.steveslockshop.com