Are you really sure it is bad? They rarely fail and the usual cause for them
to not work properly is usually a bad power supply. With little variation
this device was used on many Bosch fuel injection systems being common from
'75 or so.  Here is just one example of how common this part is.

http://www.thepartsbin.com/repsite/bosch~auxiliary_air_valve~reparts.html

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Gary Meier
Sent: Wednesday, May 30, 2012 11:03 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Auxiliary Air Regulator -- 1981 Air-cooled Westy

I have a bad auxiliary air regulator on my 81 Westy, air cooled, VW says
that it is no longer available and I can't find an on-line source. This is a
2-wire regulator and I've been told that any 2-wire unit will work. Does
anyone know what other models use a 2-wire auxiliary air regulator so that I
can substitute. Any assistance will be greatly appreciated.
Gary Meier