Fittings
Compression Unions
The right connection for every line -- sealed, secure, leak-free.
Compression unions join two brake or fuel lines with no flaring required. A ferrule bites down on the tubing as you tighten, sealing the joint -- handy when you can't get a flaring tool onto the line or you need a quick, reliable splice.
Showing 1 — 16 of 19 Products
Showing 1 — 16 of 19 Products
Brake Line Fitting
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Brake Line Fitting
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Brake Line Fitting
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4 Reviews
Brake Line Fitting
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Fuel Line Repair
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Fuel Line Repair
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1 Review
Fuel Line Repair
Rated 5.0 out of 5 stars
1 Review
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When to use a compression union
They shine in tight spots and field repairs where cutting a proper flare isn't practical. That said, many shops prefer a flared joint for permanent brake work, so check your local inspection rules before you commit. Match the union to your line size, cut the tube square, and tighten to spec so the ferrule seats evenly.
Related: Unions, Tube Nuts, Flaring Tools, Adapters, Quick Connects, All Fittings.
Compression Union FAQ
What is a compression union?+
It joins two lines with a ferrule that bites the tubing as you tighten -- no flaring tool required.
When should I use one?+
In tight spots or field repairs where you cannot flare the line. Many shops still prefer a flared joint for permanent brake work, so check local rules.
How do I install it correctly?+
Cut the tube square, match the union to your line size, and tighten to spec so the ferrule seats evenly.