You likely don't need it, but you can get the assembly: http://vanagonwestfaliaparts.com/product/faucets-pumps-plumbing-h20/westfalia-sink-parts-p-trap-kit/ 

Every Westy I've owned or worked on (4 now) the bottom part has fallen off the top part.  That screw just plugs a useless drain hole, plug it with silicone, and use Goop to glue the trap to the bottom of the top part.  This has worked for me for years now, and I just did this repair on my son's '87.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Eric Caron
Sent: Saturday, August 08, 2015 1:38 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Sink problem, where to find parts?

Hi folks,
 While trying to improve wiring under my sink the drain fell apart. 

Is there a vender that has the parts so i can get them quick as I’m off for a trip on Thursday. 

the part that broke looks like a tiny bolt that  goes straight up into the drain holding the bottom up against a thin gasket. the tiny screw is completely rotted away and the bottom of the drain is dangling.  the plastic parts are old and fragile so i’m hoping I can get replacements. 

Any tips would be greatly appreciated as I really use and depend on that sink when camping.

Eric 

85 GL Auto Westfalia =