What Is This?

[NoScope]

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.

 

[mjp2]

The thread that you grabbed your image from says they're Spark Plug Tube Seals. https://www.f150forum.com/f38/5-4-3v-spark-plug-tube-seals-517524/

Googling that term led to https://www.tascaparts.com/oem-parts/ford-spark-plug-tube-seal-f5ly6c527a

 

[NoScope]

Not the same part.

 

[mjp2]

Not the same part.

Have you tried calling a dealership? You know exactly what the part is and just need the part # at this point.

 

[NoScope]

Ford Dealer Stumped, 2 other dealers said I was nuts. The seals are there and I doubt they only come with the heads