At 07:55 AM 2/15/2010, gneiss9 wrote:
>I am trying to attach a PVC tap to my '91 Westy potable water tank
>drain.  Does anyone know what material these Vanagon Tanks are made of?

Dear Trevor,

I'm 99% sure those tanks are polyethylene.  Good luck getting
anything at all to stick to it.  I suggest you cast (or cut) a set of
threads to fit the spout, or else mechanically attach your valve with
a flange and gasket bolted to the bottom of the tank.  That would
entail cutting through the sheet metal beneath the tank.

Yours,
David