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Group: Moderators
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I saw these on eBay. They were cheap so I got them. What are they used for? F-63 on the thermostat cover. F-66 on the water pump cover. 
Lawrenceville, GA
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Group: Forum Members
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My wife asks the same thing upon returning from yard sales.
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Group: Administrators
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Those are new to me. Possibly some kind of marine or industrial application?
  Lorena, Texas (South of Waco)
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