Looks like it could be the coolant filler cap, check the serial number - the latest design has a suffix 04. They are not expensive from your nearest supplier.
Any earlier number is suspect.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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