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why do some catch cans have a breather and some don't?

Old Apr 22, 2010 | 09:27 AM
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Default why do some catch cans have a breather and some don't?

Doing some research about catch cans. Anyone know the role of breathers on a catch can? Those who have breathers seem to be more expensive.

And, I saw some on ebay with $18 and some brands asking for $200! I'm also pretty curious about the difference.
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