87 Monaco lost gas cap, need help

Discussion in 'Sport Cruisers' started by Kevin Gannon, Aug 21, 2019.

  1. Kevin Gannon

    Kevin Gannon New Member

    Aug 21, 2019
    1987 Sea Ray Monaco 21’
    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.
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    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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