OK, I did a little more looking, which is prompting more questions. I see the anti-drainback flap now on the W719/5, after David described its location a little more for me. But I just looked at an STP and a Fram that I have, and I see rubber under the holes on top as well. I thought that the idea behind using a Mann or Mahle instead of a department store filter was that the cheap ones didn't have the anti-drainback valve. But isn't that what I'm seeing on the STP and the Fram?

Thanks,
Ed

> 
> AHA- now I see it. I was looking for something down inside the filter. But I now see the valve/flap just under the holes outside the thread-on connector. 
> 
> Thanks,
> Ed

> > 
> > He means the threaded end of the filter, not down inside.  The holes
> > with the check-flaps are between the large central hole and the outer
> > edge of the filter.
 > --
> > David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/

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