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      11-27-2011, 04:43 PM   #14
Quickid
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Drives: 08 Z4MC, 06 X5 4.4i, 99 323i
Join Date: May 2010
Location: Ontario, Canada

iTrader: (4)

Yes, that is the vent hose. My X5's OEM battery had two identical holes, one was plugged and the other had the vent tube attached. The replacement battery from CTC had the same configuration so I just took the plug from the old and used it for the replacement.

It should be on the exact location on the other side but it's also possible yours only have one hole.
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