Brent,
Yes, it does. The trap assembly is installed the same way
as it would be in your kitchen sink.
I also replaced the complete assembly with a new one in
my westy.
The problem I had was that the inner stainless steel screw/strainer
(the one that you see from the top of the sink)
was so stuck to the plastic part underneath with 10 year old
crud that it wouldn't unscrew.
So I carefully had to cut a notch with a hacksaw blade in the
plastic underneath the sink to release the tension,
so I could unscrew the top stainless part.
(if you do that, be careful not to cut too deep and damage the
 stainless steel screw/strainer part).
I used a pair of needle nose pliers to hold the
stainless screw/strainer in place, while unscrewing the plastic
fitting underneath the sink.
Good luck.
Harald
'90 westy

----------
> From: Brent Christensen <bpchristensen1@HOME.COM>
> To: vanagon@GERRY.VANAGON.COM
> Subject: removing the sink drain
> Date: Saturday, April 22, 2000 11:15 AM
>
> Does the white plastic sink drain just unscrew from under the sink?  (I'm
> talking about the entire assembly, not just the lower "trap" portion of
it,
> which does indeed unscrew)
>
> Thanks
>
> Brent Christensen
> '89 GL Syncro Westy "Klaus"
> Santa Barbara, CA