Bob ... I had the same problem and water entered fuel tank, causing obvious expensive problems. Recommend you replace it with a steel cap ... or tell your mate to take her high heels off before boarding the boat.
The caps are what we have on our c30 1988. I have purchased these once in 4 years and about to order them again (expensive little buggers). They look so nice at first but fade pretty rapidly. We have never had any leakage from these though .
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