Yes, it's the returning hose to the upper valve cover. Just gently press the ring and pull it apart. I won't recommend doing it if the hose has become brittle.
Quote:
Originally Posted by Ricky Bobby
Where you pulling from the hose by the valve cover?
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01' 3.0i E53 (M54) with 164,000 miles 
07' 3.0si E83 (N52) with 134,000 miles 
08' 3.0si E70 (N52) with 91,000 miles 
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