yeah, that�s the ticket, an anti-siphon valve.

alistair

On Feb 26, 2014, at 9:01 AM, mark drillock <mdrillock@COX.NET> wrote:

> 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
>>> 
>>> 
>>> 
>>>