Unions are used in automotive purposes to join to pieces of brake, fuel, or transmission line together with the addition of two tube nuts. One example where you may need a brake line union is when running a long line from a dual master cylinder to the rear axle. It is important to match the thread and flare of the union and tube nut to ensure a leak-proof connection. These unions are for use with our "ASD 3/16" Tube Nuts (3/8" - 24) Inverted Flare, Pack of 15" and any 3/16" brake line you choose. Will work with steel, Poly Armour, and NiCopp.
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