4LifetimeLines 3/16" High-Pressure Compression Union – Black-Oxide Coated Steel, Leak-Tight Tube Connector, No Flaring or Welding Required, Up to 5,000 PSI (1 per Bag)

The 4LifetimeLines 3/16" high-pressure compression union gives you a fast, reliable way to join two sections of 3/16" tubing without flaring or welding. The fitting uses a precision-machined compression sleeve that forms a leak-tight mechanical seal when tightened to spec — no specialty tools, no torch, no flare kit required. Just cut your tubing clean, slide on the nuts and sleeve, and tighten. It's rated up to 5,000 PSI when properly installed, making it suitable for brake lines, fuel lines, transmission lines, and other high-pressure tubing systems. The body is made from durable galvanized steel with a black-oxide coating that resists corrosion and rust. This makes it a reliable choice for underbody installations, engine bay routing, and other locations where the fitting will be exposed to road salt, moisture, and temperature swings. The black-oxide finish also provides a clean, professional appearance. This compression union is compatible with standard 3/16" OD tubing including stainless steel, copper-nickel alloy, and standard steel brake lines. Use it to splice new tubing to an existing line, extend a run, or make an inline repair on a damaged section — all without having to replace the full line from end to end. It's a go-to fitting for professional shops, fleet maintenance operations, and DIY mechanics who need a permanent, high-pressure repair done quickly. Each fitting ships individually bagged for clean storage and easy inventory management. Also available in a 2-pack for jobs that require multiple splice points. This takes the description from a single paragraph that restates the bullets to four focused paragraphs that expand on how the product works, what it's made of, what it's compatible with, and how it ships — all in a straightforward, spec-driven tone that matches the quality of your bullet points on this listing.

• QUICK INLINE REPAIR — NO FLARING OR WELDING: The 3/16" compression union joins two tube sections with a mechanical seal using a precision compression sleeve. No flare tools, no torch, no special equipment — just tighten the nuts for a secure, leak-tight connection. Ideal for fast repairs in the field or the shop.
• RATED UP TO 5,000 PSI: Built for high-pressure applications when installed to spec. Suitable for brake lines, fuel lines, transmission lines, and other demanding tubing systems where a reliable, high-pressure seal is critical.
• BLACK-OXIDE COATED STEEL CONSTRUCTION: The black-oxide finish provides a layer of corrosion and rust resistance, extending the life of the fitting in harsh, moisture-prone, and road-salt environments. Durable enough for underbody and engine bay installations where fittings are exposed to the elements.
• WORKS WITH COMMON 3/16" TUBING: Compatible with 3/16" OD brake line tubing including stainless steel, copper-nickel, and standard steel. A versatile connector for splicing new tubing to existing lines, extending runs, or repairing damaged sections without replacing the full line.
• SHOP-READY PACKAGING — 1 PER BAG: Ships individually bagged for easy inventory control. Available as a single unit or a 2-pack. Clean, organized packaging for service trucks, shop shelves, or parts bins.
• BUILT TO LAST — STEEL CORE DURABILITY: The galvanized steel body provides structural strength that won't fatigue or weaken over time under vibration, pressure cycling, or temperature swings. A permanent repair solution, not a temporary fix.