#4 Flare Union

The #4 Flare Union by XRP-XTREME RACING PROD. is a precision straight adapter fitting engineered for high-performance hydraulic and fuel line systems in modified vehicles and racing applications. This 4 AN to 4 AN male adapter serves as a critical junction point in custom plumbing setups, allowing technicians and enthusiasts to connect two male fittings in a direct, inline configuration. Whether you're building a custom fuel system for a turbo upgrade, installing braided stainless steel brake lines, or designing a high-flow cooling circuit, this flare union ensures reliable connections under demanding conditions.

Manufactured from aluminum and finished in hard-anodized blue, the #4 Flare Union delivers corrosion resistance and lightweight durability essential for underhood environments. The flare union design uses a proven 37-degree JIC flare seal—the industry standard for automotive hydraulic fittings—to create a metal-to-metal seal that resists vibration-induced loosening and maintains integrity under pressure cycling. At just 0.04 lbs, this compact adapter minimizes system weight while the 4 AN size (nominally 1/4-inch line) handles substantial flow rates typical of fuel injection, nitrous oxide delivery, and transmission cooler circuits on modified and race vehicles.

This fitting is ideal for fabricators, drag racers, and street machine builders who demand repeatable quality and proven compatibility with XRP's extensive line of hose, fittings, and adapters. Installation requires standard AN wrench sizes and hand-tight sealing with a final quarter-turn—no thread sealant needed on JIC flare connections. The blue anodized finish provides visual identification on complex line layouts, simplifying future maintenance and troubleshooting. Stock this adapter for emergency repairs or as a core component in custom system designs where direct male-to-male coupling eliminates unnecessary length and potential leak points.