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Fittings

Brake Line Fittings – Adapters, Tube Nuts, Unions & More
Find the right connection with 4Lifetime’s high-quality fittings. From bleeder screws and adapters to tube nuts, unions, and compression fittings—our collection is built for tight, leak-free performance in automotive, industrial, and DIY applications. Durable. Reliable. Trusted.

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$85

Showing 1 — 16 of 218 Products
Showing 1 — 16 of 218 Products
3/16" & 1/4" Fitting Assortment | 32 SKU
Brake Line Fitting Assortments
4.3
Rated 4.3 out of 5 stars
7 Reviews
3/16" & 1/4" Fitting Assortment | 32 SKU
$84.99
3/16" (3/8-24 Inverted) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fittings
5.0
Rated 5.0 out of 5 stars
4 Reviews
3/16" (3/8-24 Inverted) | Tube Nut | Stainless Steel | 10ct
$9.99
3/16" ( 3/8-24 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fittings
3.0
Rated 3.0 out of 5 stars
2 Reviews
3/16" (3/8-24 Inverted) | Steel Tube Nut | 10ct
$7.99
3/16" Metric 10x1.0 Bubble | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fittings
5.0
Rated 5.0 out of 5 stars
1 Review
3/16" Metric 10x1.0 Bubble | Steel Tube Nut | 10ct
$8.99
3/16" 3/8-24 Inverted | Brass Brake Line Union | 10ct - 4LifetimeLines
Brake Line Unions
5.0
Rated 5.0 out of 5 stars
4 Reviews
3/16" 3/8-24 Inverted Brass Brake Line Union | 10ct
$6.99
Sale
3/16" Brake Line Tubing Clamp | Single Slot | Bag of 10
Tools
4.4
Rated 4.4 out of 5 stars
5 Reviews
3/16" Brake Line Tubing Clamp | Single Slot | Bag of 10
$6.99 $5.29
$7.99
3/16" (M10x1.0 Inverted) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fittings
5.0
Rated 5.0 out of 5 stars
2 Reviews
3/16" (M10x1.0 Inverted) Stainless Steel Tube Nut | 10ct
$11.99
3/16" | Brass Compression Union | 10ct - 4LifetimeLines
Compression Unions
5.0
Rated 5.0 out of 5 stars
6 Reviews
3/16" | Brass Compression Union | 10ct
$8.99
High Pressure Compression Fitting Union | 3/16" | Bag of 1
Compression Unions
5.0
Rated 5.0 out of 5 stars
1 Review
High Pressure Compression Fitting Union | 3/16" | Bag of 1
$3.99
3/16" Brake Line Fitting Assortment | 24 SKU - 4LifetimeLines
Brake Line Fitting Assortments
4.8
Rated 4.8 out of 5 stars
6 Reviews
3/16" Brake Line Fitting Assortment | 24 SKU
$46.99
3/16" (M10x1.0 Bubble) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fittings
4.8
Rated 4.8 out of 5 stars
5 Reviews
3/16" (M10x1.0 Bubble) Stainless Steel Tube Nuts | 10ct
$10.99
3/8" (5/8-18 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fittings
5.0
Rated 5.0 out of 5 stars
1 Review
3/16" (M10x1.0 Inverted) Steel Tube Nut | 10ct
$9.99
1/4" | Brass Compression Union | 10ct - 4LifetimeLines
Compression Unions
5.0
Rated 5.0 out of 5 stars
3 Reviews
1/4" Brass Compression Union | 10ct
$9.99
3/8" (5/8-18 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fittings
5.0
Rated 5.0 out of 5 stars
2 Reviews
1/4" (7/16-24 Inverted) Steel Tube Nut | 10ct
$6.99
(3/8-24 Inverted) | Brass Brake Line Union Tee | 10ct - 4LifetimeLines
Brake Line Union Tees
5.0
Rated 5.0 out of 5 stars
4 Reviews
(3/8-24 Inverted) | Brass Brake Line Union Tee | 10ct
$9.99