Napa Auto Parts has them - about $8.50.

On Mar 23, 2010, at 11:24 AM, John Meeks wrote:

> Jeff,
>
> If you know of a source for those square filters, let us know.  I
> haven't
> found any online or local.
> I did find a nice aluminum adapter from Van-Cafe.com that steps up
> from the
> 7mm tank outlet to the 11mm pump inlet. Got one of those on the way.
>