#8 MJIC X #12 FJIC 90*

For a 90 degree turn between those two JIC sizes, this adapter matches that setup. It is a forged steel 37 degree flare union elbow with a 3/4-16 male JIC (SAE J514) on one end and a 1-1/16-12 female JIC swivel (SAE J514) on the other.

It sure will. This elbow is made with both male and female JIC 37-degree flare threads that meet SAE J514 specs, so it'll play nice with other standard JIC fittings.

they're two different thread sizes. The male JIC end is 3/4-16 and the female swivel end is 1-1/16-12. That size difference is actually the whole point of this fitting. It lets you connect a smaller #8 line to a larger #12 port without needing an extra reducer in the middle. Both ends follow SAE J514 spec, so they'll mate up correctly with standard JIC components on either side.

On the connection side, it is a 90 degree elbow with a #8 male JIC SAE 37 degree flare on one end and a #12 female JIC swivel 37 degree flare on the other. Both ends are called out to SAE J514.