1/8" Brass Compression Union

The 4LifetimeLines® 1/8″ Brass Compression Union delivers a leak-proof, metal-to-metal seal without flaring—ideal for brake, fuel, oil, or hydraulic hard-line joins. Machined from dezincification-resistant brass, this union stands up to winter salt, moisture, and chemical exposure, ensuring lasting reliability in harsh conditions.

Key Benefits

Universal Compatibility: Works on 1/8″ steel, copper-nickel, copper-coated steel, PVF-coated, and stainless-steel tubing.

Corrosion Resistance: Brass alloy resists pitting and corrosion for maintenance-free performance.

Compression Seal: Creates a permanent, leak-free connection—no thread sealant or flare tool required.

Winter-Ready Durability: Withstands salted roads and freeze/thaw cycles without degradation.

Lifetime Warranty: Backed by 4LifetimeLines® for confidence in every fitting.

Installation & Usage

Cut & Deburr: Trim tubing squarely and remove all burrs inside and out.

Assemble: Slide the brass ferrule onto the tube, then thread the union nut onto your mating port.

Torque to Seal: Tighten to the specified torque— the ferrule bites into the tube for a tight, permanent seal.

Inspect: Pressurize the system and confirm zero leaks before full operation.

Ready for a corrosion-proof, leak-free union?
Add the 1/8″ Brass Compression Union to your cart now and complete your hard-line joins with confidence.