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Brandon,
AN stands for Army Navy. These fitting are high pressure fitting once only used or either invented for the military. The drag racers started using them and companies started making them in stainless, and anodized blue, red. The have to be used for the braided stainless hose, like I have.
The dash numbers like -06 or -08 are equilivent of size. -06 is close to 3/8", -08 is close to 1/2". I'm not sure how they came up with the size. I'm sure it's something simple.
Check the link above to have a look.
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