BRAKEQUIP FITTING - FEMALE SWIVEL NUT 3/8NF (90)

Female swivel nuts are built so the nut itself rotates independently from the fitting body, which makes it a whole lot easier to thread onto a male fitting without twisting up whatever line or hose you've got connected. Once everything's torqued down and seated, it's fixed in place. The swivel action is there to help you get a clean connection during assembly, not to allow movement after the fact. The HF10 here uses a 3/8NF thread, so just make sure your mating connection matches that before you go wrenching it on.

This fitting is designed specifically as a female swivel nut with a 3/8NF thread, so it should be a direct fit for compatible brake line systems.