Call the manufacturer monday morning, they are in Oregon.  Ask them
where you can buy one locally or online.  They've always been helpful
when I've had questions.

and yes, the model 1315 **Separator** is the best bet for a
Vanagon...don't get an isolator.

http://www.surepower.com

>Well, thanks for the link ( www.rvparts.com) . Unfortunately the 1315
>appears to not be orderable from them. No price, and you can't add it
>to your cart.