Brakequip Fitting - Female7/16X24NS (With KEY SLOT) USA

That slot keeps the fitting properly indexed when you're making the connection, so it seats the way it's supposed to and doesn't back out or rotate under pressure. On hydraulic brake systems, a loose or misaligned fitting can cause real problems, so the key slot is there to give you a positive, repeatable lock every time you connect it.

This Brakequip fitting is designed for use in hydraulic brake systems. It features a 7/16X24NS female connection, which should be compatible with brake lines that match this specification.