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