If you know the brand of cap, perko, etc, you might find one on ebay or a marine salvage yard. If it isn't stainless you really should upgrade. The old zamak/pot metal kind can break off and spill fuel into your bilge.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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