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Speedflow manufacture these plugs to block off your O2 Sensor ports, they are manufactured in Australia from Steel, Nickel plated and then a spark plug washer is installed to ensure no exhaust leaks will occur!
We have two sizes available, M18 x 1.5 and M14 x 1.5.
Make sure to check out our O2 sensor weld bungs also.
For more info please check our FAQ's
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