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What part is part 4 of this diagram: http://www.realoem.com/bmw/enUS/showparts?id=EU33-USA-06-2002-E46-BMW-325xi&diagId=18_0428

I***8217;m trying to get my exhaust flap working again (I actually really hate the noise from the engine). I had done the golf tee mod because there was an issue with the vacuum lines and the flap would flap constantly at idle instead of opening and closing. Anyways I***8217;m loon up the part numbers for the vacuum lines and part 4 on Real OEM is grayed out. Is it just a standard vacuum line with 7.5mm inner diameter?
 
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