I'm kinda surprised you guys haven't heard of the siphon effect.

Mark

Dave Mcneely wrote:
> Good point.  But, people who deem themselves knowledgeable sure extol the importance of this oil filter feature.  mcneely
>
> ---- Alistair Bell <albell@shaw.ca> wrote:
>> I've never been clear about what the heck an anti drain back valve does on an oil filter that is pointing more or less down as it does on the wbx.
>>
>> Maybe it is an anti suck up valve?
>>
>> Alistair
>>
>>
>>
>>