Black Oxide High-Pressure Compression Union Assortment
Stop leaks and joins failing under pressure with the 4LifetimeLines® Black Oxide High-Pressure Compression Fitting Union Assortment. Engineered for up to 5,000 PSI, each union features a black oxide–coated brass body and a uniquely designed compression sleeve that bites into steel, copper-nickel, and stainless tubing for a leak-tight seal—no flare tool required. Housed in a durable tackle box, this kit equips you for fuel, transmission, air-conditioning, and hydraulic repairs in industrial or heavy-duty automotive environments.
What’s Included
24 Black Oxide Unions in three tube sizes:
10 × 3/16″ unions
4 × 1/4″ unions
2 × 5/16″ unions
2 x 10mm unions
Tackle Box Organizer with labeled compartments for quick part identification
Key Benefits
5000 PSI Service Rating — Ideal for high-pressure fuel, A/C, transmission, and hydraulic lines.
Black Oxide Corrosion Protection — Resists rust and chemical attack in harsh environments.
Universal SAE Compatibility — Works on steel, CuNi, and stainless-steel tubing without flaring.
Self-Sealing Compression Sleeve — Creates metal-to-metal grip for permanent, leak-proof joints.
DIY-Friendly — No specialized tools or thread sealants required; install unions in minutes.
Ideal Applications
Use this union kit for emergency repairs or permanent upgrades on high-pressure fuel or brake circuits, transmission cooler lines, refrigerant hoses, and hydraulic systems—whether on farm equipment, heavy-duty trucks, race cars, or industrial machinery.
How to Use
Cut & Deburr: Trim your tubing square, deburr inside and out.
Slide On Sleeve & Nut: Position the compression sleeve, then thread on the black oxide union body.
Tighten: Torque the nut to manufacturer or SAE-recommended specs—the sleeve bites in for a leak-free seal.
Test Under Pressure: Pressurize the system up to 5,000 PSI and inspect for zero leaks before full operation.
Ready for rock-solid, high-pressure tube joins? Add the Black Oxide High-Pressure Compression Fitting Union Assortment to your cart now and handle any 5,000 PSI line repair with confidence.
