What Is This?

NoScope

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Joined
Jul 15, 2014
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Location
Sicklerville, South Jersey
There is an O-ring in the Cy Head above Spark Plug as shown in picture.
2010 Expy 5.4 3V 4WD I have looked everywhere, Diagrams don't even show it. Mine were dried, brittle etc... I assume it's to help keep moisture out. Would love to reinstall with new ones.
Thanks.
5.43V.jpg
 
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