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As Kevin said it holds a reserve of vacuum, mainly needed when you turn the a/c on (which will effectively drop your vacuum from somewhere around 20-22 in/hg to probably 11-13 in/hg).
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
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