Exhaust System Diagnostic Tool Exhaust Back Pressure Tester

• Exhaust System Diagnostic Tool Exhaust Back Pressure Tester
•  Adaptor fits into oxygen sensor hole enabling back pressure of mufflers and catalytic converters 
• Gauge adapter threads intooxygen sensor ports (both 12mm and 18mm). 
• Test at idle and at2500 rpm's. Pressure should be below 1.25psi at idle and below 3psiat 2500rpms.
•  Higher readings indicate a restriction which shouldbe corrected

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