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It would be easier to help if we new what Model-year-engine you were working on. You need to add that info to your signature so the info will always be there. Assuming you are working on a 2.5 or 3.0 V-6 X-type the part you are probably looking for is shown below. The one in the picture looks like it is broken.
To remove the piece that inserts into the manifold is a trick. You press the outside ring against the manifold and gently pull the plastic tube out. To install simply insert.
Avern1, he is not after the brake booster line, he needs the vacuum line that attaches to the back of the intake manifold.
Antone, when I have broken that plastic tubing, I just get me some vacuum line and slid it over that tubing and used hose clamps to seal things up. I want to say I used some 1/4" ID vacuum line. It is something right in that neighborhood. I had some laying around in my garage.
