I'd be curious if fitting this adapter on the tank wouldn't cause issues getting a fill hose on there. It's already pretty tight to begin with. Let us know how it works out if you do go this route.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Edward Maglott
Sent: Monday, January 09, 2012 10:02 AM
To: vanagon@GERRY.VANAGON.COM
Subject: New Propane tank fill valve/fitting

I'm thinking about getting one of these for my tank.  The 1 and 3/4" ACME threads are the same as what is on a typical BBQ tank.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300647482652

Edward