Female 90 Degree Union A dapter; Size: -4AN

The Female 90 Degree Union Adapter in -4AN size is a critical hydraulic and pneumatic fitting component designed for tactical systems, military vehicles, and high-performance fluid applications where space constraints demand precision angled connections. Built by Vibrant Performance, a manufacturer trusted in motorsports and professional systems, this adapter serves law enforcement and military operations requiring reliable fluid-line routing in confined equipment bays, weapon systems, and mobile command platforms. The 90-degree geometry eliminates straight-line pressure drops and reduces hose stress in tight configurations where parallel runs are impossible.

The -4AN designation indicates a nominal bore diameter of 1/4 inch, sized for medium-duty hydraulic systems operating at pressures typical in combat vehicle suspension controls, weapon hydraulic actuators, and tactical equipment cooling loops. The female threads accept standard AN male connectors, ensuring interoperability across DOD and NATO-standard fluid systems without adapter stacking, which reduces leak points and weight. Vibrant Performance manufactures this fitting to strict tolerances using forged aluminum or ductile iron construction, providing corrosion resistance and durability in field environments where temperature swings and exposure are routine challenges for mounted and dismounted systems.

This adapter benefits technicians, armament specialists, and vehicle maintenance personnel working with hydraulic brake systems, power steering circuits, and pressurized actuator lines on tactical platforms including HMMWVs, light tactical vehicles, and portable weapons control systems. Installation requires a standard wrench—typically 5/8" or 11/16" depending on the male connector size—and should be torqued to manufacturer specification to prevent weeping and ensure system integrity under dynamic field conditions. The compact 3.45 x 0.75 x 3.5 inch profile and minimal 0.03 lb weight make it suitable for retrofit applications where every gram counts and space behind armor or in equipment pods is severely limited.