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Old 03-24-2008, 11:17 PM   #2
piecesparts
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Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
Re: ball with vacuum line

That ball is the vacuum reservoir for your vacuum operated items inside the cab. Example: vacuum operated heater controls and doors. This ball makes up the difference when you change engine RPMs and the vacuum drops on the intake manifold. It becomes a small source and can be a good thng to have. It can be mounted almost anywhere, you want it to be.
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