In a message dated 27/08/2008 5:31:38 A.M. Central Standard Time,
eduntz@hotmail.com writes:

           Ed, yes,  very easy.  When your looking at the bottom of the
filter you will see  holes around the perimeter just inside the rubber seal.
Beneath those  holes is a rubber flap.  No flap, no anti-drain back valve.  The
spring loaded valve you see inside the filter is the over pressure valve.   All
filters have them.

>>>>>>>OK, but can I tell if it has the  anti-drainback feature by looking at
it? In the W719/5, there is something  just inside which looks spring-loaded,
and I can't see down to the bottom. The  W719/12, looks like a cheap gemeric,
I can see the sides and bottom, but the  one source I can find that lists
part numbers lists this one as the approriate  one. Is the anti-drainback valve
something I can  see?<<<<<<<<<<

Cheers,

Frank  Condelli
Almonte, Ontario, Canada
'87 Westy & Lionel Trains (_Collection for sale_
(http://members.aol.com/Fkc43/trainsal.htm) )
_Frank Condelli &  Associates_ (http://members.aol.com/Fkc43/busindex.html)
- Vanagon/Vanagon Westfalia Service in the Ottawa Valley
_Vanagon Stainless Steel Exhaust  Systems_
(http://members.aol.com/Fkc43/exhaust.htm)
_BusFusion_ (http://members.aol.com/BusFusion/bfhome.htm)  a VW Camper
camping event, Almonte, ON, June 12 ~ 15,  2008