I checked out the Purolator L30005 earlier, the putative Baldwin B9 clone.
The L30005 AntiDrainback valve was good, I couldn't blow thru it. The shell is very thin, I can make it dimple like an old fashioned oil can bottom, just by squeezing. I can't do that on the Baldwin - thicker shell. BTW, my grip is weak
The store had only one L30005, and it appeared to be an older style box, so it may not be representative of current design.
But all other things being equal, I like the stronger shell on the Baldwin.
From Baldwin tech support, the B9 is rated :
- 100 psi continuous operating,
- 200 psi burst,
- 250ºF continuous operating temperature.
Note that I have NOT yet cut apart a Baldwin, nor actually installed it or used it!