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Old 08-01-2012, 08:35 PM
Franksauto Franksauto is offline
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Location: MA.
 
Join Date: Aug 2012
Posts: 4
Mein Auto: 2006 X5 4.8is
I believe that is a check valve or pressure valve. yes you do need it installed. I had one come out in one om my cars about 20 years ago. I just stuck it back in the hole it came out of and was good to go. However it wasnt a BMW.
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