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2008 Honda Civic EX Sedan
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Hello:
So I needed to take my car in for some repair work (cracked transmission case). A few days later, I went to check the transmission fluid level and noticed the cap that was on this tube is now missing. I'm clueless as to what it is and what it does. If anyone out there knows please respond. Thanks in advance.
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That's a vent/breather tube for your transmission. It's just a place for air to come out for the fluctuating temps of the transmission fluid. It's supposed to have a rubber cap on it though. Honda part 21396-P20-000.
 
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