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

    1
    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
    PA
    Various
    Various
    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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