4LifetimeLines Black Oxide Steel High-Pressure Compression Union
Not sure what size you need? 3/16" is the most common brake line size — check the size chart or call 1 (855) 928-4024.
- 4.8★ from nearly 4,000 Amazon ratings
- Free US shipping on orders $50+
- Ships same day when ordered by 2 PM ET (Mon–Fri)
- Lifetime warranty on every product
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What most customers add to finish the job
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
Lifetime Quality, Covered — for Life
Zero Risk, Maximum Confidence
Built to Endure. Guaranteed to Perform.
One-Time Purchase. Lifetime Assurance.
FREE SHIPPING
Spend $50. We Cover the Rest.
BUILT TO ENDURE
No Weak Points. No Compromises.
LIFETIME WARRANTY
One Purchase. Lifetime Coverage.
TRADE FRIENDLY
Tax-Exempt Pricing for Qualified Buyers
The 4Lifetime Difference
Engineered to Last. Backed for Life.
Engineered to Last. Backed for Life.
When we say lifetime warranty, we mean it. Our products are built to endure & we stand behind them.
No Corners Cut. Ever.
No Corners Cut. Ever.
Quality materials. Proven craftsmanship.
Built with materials and workmanship we trust. No shortcuts.
A Smart, Risk-Free Buy
A Smart, Risk-Free Buy
Buy once. Be done.
This isn’t a temporary fix — it’s a long-term solution. Built-in confidence. Zero guesswork.
Straightforward. No Fine Print.
Straightforward. No Fine Print.
What you see is what you get.
Clear terms. Honest coverage. No hidden clauses. No loopholes. No runaround.
Backed for the Long Haul
Backed for the Long Haul
We stand behind every product.
As long as you own it, we’ve got your back.
