Description： UPGRADE TO 22 FITTINGS: 2 x 3/16″ (3/8-24) Threads Unions; 2 x 3/16″(9/16-18) Inverted Tube Nut; 2 x 3/16” (1/2-20) Inverted Tube Nut; 2 x 3/16” (7/16-24) Inverted Tube Nut; 14 x 3/16″ (3/8-24) Inverted Tube Nut. Premium Material: Our zinc-coated brake line is made of alloy steel to prevent oxidation. All brake pipe fittings are made of anti-rust brass, which has a long service life. .