87 Monaco lost gas cap, need help

Kevin Gannon

New Member
Aug 21, 2019
1
Boat Info
1987 Sea Ray Monaco 21’
Engines
350 Mercruiser
Missing chain on gas cap finally caught up with us as I dropped the screw in cap overboard. 1 1/4’ NPT Caps I’ve tried are close but seem to have the wrong thread, seems too coarse. Would anyone know the number or other info on a cap that might fit. Thanks in advance.
 
They're not a pipe thread - it's a straight thread that seals with an o-ring. Most likely you have a 1-1/2" fitting (for use with 1-1/2" gas line). Chances are most local marine stores will have something in stock. But check out Perko's website - there's a good chance they were the original supplier.
 

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