#4flare/#4flare Stl Unio

The AEROQUIP #4 flare steel union adapter is a precision straight-through fitting engineered for high-pressure hydraulic and pneumatic systems where reliable connections are non-negotiable. Designed for professionals in automotive, aerospace, industrial, and tactical applications, this #4 AN male-to-male adapter provides a leak-free junction that withstands demanding operating conditions. Its compact footprint and robust construction make it an essential component for custom fluid line assemblies, system repairs, and equipment upgrades.

Manufactured from hardened steel with zinc oxide plating, the #4 flare steel union delivers superior corrosion resistance and durability in harsh environments. The straight configuration eliminates flow restriction, critical in applications where pressure drop and efficiency directly impact performance. The dual #4 AN flare port design ensures compatibility with standard AN hose fittings and adapters, allowing seamless integration into existing or new fluid systems. Zinc oxide coating protects against oxidation while maintaining the precision tolerances required for flare-sealed connections that eliminate reliance on thread sealants.

Technicians, equipment manufacturers, and tactical operators rely on this fitting for brake systems, fuel delivery networks, coolant circuits, and pressurized gas lines. Its lightweight profile (0.06 lbs) makes it ideal for weight-sensitive platforms without compromising strength. Installation requires only standard wrenches; the flare connection method ensures a secure seal without overtightening. Verify hose and line specifications match #4 AN sizing before ordering—this adapter is sold individually and pairs with matching flare-sealed hose assemblies for complete system integrity.