There are several differences between "comparable" industrial AN and JIC 37° Flare Fittings flare style fittings. Some include
JIC x BSPP Male Connector with ED Seal, JIC fittings – Reliable Fluid Systems
JIC fitting - Wikipedia
The Differences Between AN and JIC 37° Flare Fittings
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JIC Fittings - JSEAL™ / JIC 37° Flare & UNO - RYCO Hydraulics
DK-LOK JIC Fittings: Superior, high-quality tube connections
3) WEATHERHEAD C5755x4 1/4 JIC 37 x 1/8 NPT Male Run Tee Fitting Flare-Twin
37 deg flare fittings, JIC 37 degree flare fittings, flared tube fittings
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