Anyone wanting to see a photo of the much discussed Auto Stop variant of
the Westy propane tank, here you go. This Ebay auction includes one and
has a photo of just the tank you can look at. The AS valve version has
the small circular pipe that attaches high on the right end of the tank,
connecting down to the fill valve body. If your tank has that small
curved tube, you have an Auto Stop valve.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=200012455345

I have nothing to do with the auction. The interior looks pretty beat up
and the fridge looks like one from an earlier than 85 year, judging by
the green meter inside that idicates flame lit. Also the Westy led panel
does not have the pilot led that most of us are used to having, instead
having 4 leds for water level, 2 lower red ones. When the very bottom
red led is lit, the sink pump is diabled by a power transistor in the
led panel. 80-81 had this configuration, with a 182A rather than a 182B
Dometic.

Mark