Parker Racor vacuum gauges are designed to measure pressure and restrictions inside the fuel filter. A vacuum gauge can be used to help determine when a filter element needs replacing, indicated by the gauge display's excessive resistance. The fuel filter pressure gauges feature a 63.5mm (2-1/2") diameter face, protected by a clear polycarbonate lens, for clear and easy readings. These Racor vacuum gauges measure -30 to 0 "Hg.
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