Spark plug O-rings. There are two size O-rings that go in the tube. I'll try to remember to post some pics of them when I replace ours in a few weeks. It seems to be a common thing after several miles (we're at 72K miles and a little oil shows around the tubes).
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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