Swivel Union Female -4 to Female -4

The ALLSTAR PERFORMANCE Swivel Union Female -4 to Female -4 (SKU ALL 49701) is a straight-fitting adapter designed to connect two female 4 AN hose lines with full 360-degree rotation at the junction point. Constructed from aluminum and finished in black anodized coating, this swivel union eliminates binding and twisting stress during assembly and operation—a critical feature in high-pressure fluid systems where hose kinks and line tension can cause premature failure or leaks.

The -4 AN female swivel configuration accepts standard 4 AN hoses on both ends, making this adapter ideal for custom fluid lines in racing, performance automotive, and industrial hydraulic applications. The aluminum construction keeps weight minimal while the black anodized finish resists corrosion and provides durable protection in demanding environments. The straight flow path—rather than 90-degree or 45-degree angles—ensures direct routing when space and line geometry require inline connection without bends. Weighing just 0.03 pounds, this fitting integrates seamlessly into tight engine bays or equipment chassis.

Users working on custom fuel systems, coolant circuits, or power steering lines benefit from the swivel design's ability to rotate freely during hose installation—eliminating the need to pre-route both hoses before assembly. The female-to-female configuration makes this fitting particularly useful as a mid-line connector when extending or reconfiguring existing hose runs. Technicians and builders familiar with AN fittings will recognize this as a precision component that meets the exacting standards expected in performance and restoration work.