Please read the rules to determining the legality of parts
The rules read:
. Pneumatic storage tanks (with the exception of White Clippard tanks P/N: AVT-PP-41),
The illegal tanks are the White Clippard tanks from 2013, this is a specific one
This is a specific white tank... ALL white pneumatic tanks are
not illegal
Here are some examples from AndyMark
Note 3 of 4 are white ... and they are legal..
http://www.andymark.com/Pneumatics-s/398.htm