Yep, presence of the 'anti-drain back' valve depends on the application.
Many are still produced without the valve. I don't think though that you
can find any non-valve filters listed for the 4.0L.

Steve
http://xjeep.dyndns.org


Mike Romain wrote:
> The ones that call for a backflow valve get them, especially the CT
> ones!
>
> I do not think the filter on the 258 has one because the filter sits
> down so it can't empty out by itself. Not sure about the 4.0 filters.
>>
>>Jerry Bransford wrote:
>>
>>>I haven't heard of any oil filter that doesn't have a check valve Frank.
>>> Even the cheapest Fram filters have that.