Solid Brass Brake Line Adapter Male 3/8-24 To A Female 7/16-24 Inverted Flare. Used to Convert 3/16" Brake Line to 1/4" Brake Line Tubing Match the thread and flare type to the lines being connected. It is important that both flare type and thread match for a leak-proof connection. SAE Thread Size 3/8-24 Male, 7/16-24 Female