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Catalytic Converter > < Vacuum Check Valve, AIR|Description and Operation

Mustang V8-302 5.0L COBRA (1995)

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Vacuum Check Valve: Testing and Inspection

Vacuum Check Valve

The check side of the valve will hold the highest vacuum seen on the vacuun side.  If not, replace it. 

Catalytic Converter > < Vacuum Check Valve, AIR|Description and Operation