It's the drain to the Dometic Fridge.

When propane burns in the combustion chamber (when fridge running on
propane) moisture is produced. In theory, it should drain out this
tube.  (these tubes can get clogged with rust/w.h.y.)

When running your fridge, the plug should be screwed in.

Cheers,

Neil.

On Tue, Jun 3, 2008 at 10:08 AM, Jamie Fitterer <fittdog8848@hotmail.com> wrote:
> http://www.thesamba.com/vw/forum/album_page.php?pic_id=446375
>
>
> I have one but not sure what it is used for?

--
Neil Nicholson '81 JettaWesty "Jaco
http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
http://web.mac.com/tubaneil
http://tubaneil.googlepages.com/