On 1-15-18, I asked AGS the following through the contact form on their website:

Hello AGS,

Are stainless steel fittings compatible with the NiCopp brake lines (talking about 3/8-24 SAE fittings on 3/16" lines) ?

Thanks,

Bob W
Omaha, NE

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On 1-17-18 I received the following reply:

Yes. They are compatible.

Christian Byar
Senior Product Manager
AGS Company Automotive Solutions