Probably a Dumb Question - O-Rings for AN fittings on Aeromotive Fuel Filter?

[gbranham]

I'm not happy with my bullet-style Summit fuel filter, so I've purchased an Aeromotive canister style fuel filter (12317). I've also purchased some -6AN to 3/8NPT fittings for it, so I can hook it up to my PTFE braided stainless fuel line that is already fitted with -6AN fittings. Neither the Aeromotive filter nor the fittings I purchased come with nitrile fuel-resistant o-rings. I assume I need them, or do the 3/8NPT threads not seal the connection in the fuel filter lid, sort of like brake line fittings, where the double flare seals it, and not the threads?

Thanks,

Greg