I replaced my Main Vacuum line Plastic Tubing with Rubber Emissions Hose and made it longer an ran it along the Fender Well.
That way I am not likely to Crack it as I did with one of the Nipples when I did my first Oil Change.
Now the Hose is not as much in the way as it used to be.

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84 300D, 82 Volvo 244Gl Diesel