NCDiesel--

Thanks for the response to my post. If there is another valve in the filter I sure cannot find it. I just went out to my shop and cut through the full flow section with a bandsaw to make certain that I wasn't missing anything. But the rubber flapper valve is all there is.

There is the possibility that our filters are different so maybe you could cut yours open next time you change a filter. It's a little messy to do but it is worth the trouble to see what is in there.

Regards--

Paul