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They are "tapered" threads, bigger on the outside and progressively smaller on the inside. You can't use a "standard tap" to clean the threads.
If I had to make a "SWAG", I'd guess the threads are 3/4" NPT (tapered).
What are you trying to do that would need the thread size?
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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