Breather Filter

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I'm preparing to do a Weber conversion on my '88 LX. The Weber 40DCOEs are being shipped as we speak (won them on Ebay, thanks Phydeaux for the inspiration!). I've noticed that some on the board with carb conversions have replaced the PCV valve with a breather filter. Nopionline.com has like a 7 different kinds of these ranging from $5 to $14 and 2 different sizes - 9mm and 12mm. What size do I need and does anyone recommend one over the other? Thanks!

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[1988starter]

I know you can get an apc one for like 10 bucks at pepboys I think 12 but am not sure.

[smufguy]

just take the psv hose from your car and compare the opening with that in the store. a friend of mine had a breather put on his 93 corolla that was meant for a civic (dont know which gen it was) the breather was too big for the one on his car and he clamped it soo hard that it started to rip. so do check out the size before u buy it