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1984 380SL, 1991 300E
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Good evening, all. I was inspecting some vacuum connectors tonight and found this guy with nothing attached. Can anyone tell me what this should connect to and while you're at it, what this device is? Not sure why the photo rotated but photo is from front of car with my finger pointing toward the left side of the car. Thanks.
 

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It Is What It Is, Dude
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That is the control pressure regulator, more commonly referred to as the WUR or warm up regulator, and that elbow is a vent to atmosphere.
 
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