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O-ring acts as an interfernce to prevent natural self-llosing of plug, caused by engine vibration.


This prevents SMART-O® from falling out out due to vibration over time, if not tightened properly.


This also prevents self-loosening through vibration, oil leaks and ultimately engine damage.


Tested by the Oakland University Fastening & Joining Institute and Specturm Technologies, Michigan.
Proven to resist excessive vibration forces.

Read more about SMART-O Performance>>