Join Date: Jul 2008
Location: Jacksonville, Fl
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The adapter is a widget that you use to put a vacuum gauge on top of the racor filter. The theory being that when the output side of the filter has too much vacuum on it, the filter is clogged. They work. I never had much luck with the o-rings they sent, though. Replaced them with a little fiber washer that I greased up liberally with vasoline.
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