A place selling the YZZB5 claims they're the same:
Isn't the bypass valve an important feature to have? I thought most quality filters had a bypass valve.
You'r right about the YZZB5 being available as a lower cost filter to dealers. I question their claim, though, as your description of both filters certainly makes the 20004 sound better than the YZZB5.quote:
The -20004 filter sells for $9.60 each. The -YZZB5 is the STAR program equivalent of the -20004, and has all the features of the -20004. Because we purchase the -YZZB5 in large quantities, we sell the -YZZB5 for $3.95 each, when purchased by the case
Isn't the bypass valve an important feature to have? I thought most quality filters had a bypass valve.