I have one also for our Westy, it actually came with our Westy when we bought it from there PO some 20 years ago.  We have connected 20 pounders and 60 pounders when camped out on the beach in Mexico for 3 ~ 4 months, no problem.  One end is a fill valve adapter the other end is the 20 pounder or 60 pounder adapter, Easy peasy. Go see your local propane supply outlet.  May not be legal in all localities so beware.

> On Oct 20, 2015, at 10:06 PM, Automatic digest processor <LISTSERV@GERRY.VANAGON.COM> wrote:
> 
> I've long puzzled about a way to temporarily connect a portable tank to the
> fill valve as a way to get me by when the tank goes empty on a trip.  I
> purchased a fitting to go on the fill valve and was going to rig up
> something just like this and test it out next time my tank goes empty.
> There was some question about if the pressure in the dispo tank would be
> enough to push open the fill valve.

Cheers,    

Frank Condelli
Almonte, Ontario, Canada
'87 VW Westy, '00 Kawasaki 250 Sherpa, "98 Ducati 750 Monster & Lionel Trains (Collection for sale <http://frankcondelli.com/trainsal.htm>)
Frank Condelli & Associates <http://www.frankcondelli.com/> - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
Vanagon Stainless Steel Exhaust Systems <http://frankcondelli.com/exhaust.htm>
BusFusion <http://www.busfusion.com/> a VW Camper camping event, Almonte, ON, June 04 ~ 07, 2015