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Registered
Join Date: Dec 2000
Location: The Hague, Netherlands
Posts: 806
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They slide over the valve stem to protect the valve stemseal during fitting. Without using those, the seal might be damaged by the slots in the valve stem
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Peter
'13 981S
'73 911T
'05 996 4S cab, now gone
'70 911S Targa, now gone
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