Westfalias 80 thru Early 81 used the larger drain and waste water
ventilation system because RV regulations in the US and Canada of the time
required it.  It was basically a "carry-over" design from the 76-79 Westies
and in fact many of the parts interchange with it.  Late 81-91 Westies used
the simpler P-trap and Flex Hose without any vapor ventilation as the
regulatory guys figured it wasn't really needed.  In fact, this and similar
systems today are used on small trailers being sold right now.
--
Jim Thompson
84 GL 1.9 "Gloria"
84 Westfalia 2.1 "Ole Putt"
73 K Ghia Coupe "Denise"
72 411 Station Wagon "Pug"
oldvolkshome@gmail.com
http://www.oldvolkshome.com
jim@airheadparts.com
***********************************
On 8/6/08, craig cowan <phishman068@gmail.com> wrote:
>
> So i couldn't help but notice on my '80 westy donor, the sink drain is this
> massive 2'' (ish) pipe and i can't help but think it's extremely excessive.
> Furthermore, mine has some kind of EXTRA outlet on the outside of the van,
> a
> 4th plastic cover located higher than the others and right behind the
> driver. Someone said this was to help release vapors from the drain or
> something of that nature?
> Well i really would rather keep to making only one hole in the side of my
> van, for the fridge flu vent......so is there anyway i can bypass this? I
> see GoWesty sells adaptors from the 2'' pipe down to some 1/2'' (ish) soft
> hose. Could i just get an adaptor to soft hose and run soft hose down
> through the cabinet and out the bottom? Maybe back to another "Big" adaptor
> at the bottom so as to utilize the stock undercarriage drain system, or is
> the venting of the drain system a serious concern on vanagons?
> How'd the latter models do it?
>
> -Craig
> '85GL (With rear seat and rear cabinet). Holes cut.
> '80 Westy ("The smoke lounge")