AN Expander #4 Female x #6 Male

The AN Expander #4 Female x #6 Male from Triple X Race Components is a critical adapter fitting for high-performance fuel, oil, and coolant systems in race cars, custom builds, and modified street vehicles. This straight swivel adapter bridges mismatched AN hose port sizes, allowing mechanics and fabricators to connect #4 AN female ports to #6 AN male fittings without compromising flow integrity or system reliability. For anyone building or modifying a performance engine bay, this fitting eliminates the need for costly custom hose runs or system redesigns.

Machined from aluminum and black anodized for corrosion resistance, the AN Expander #4 Female x #6 Male delivers durability and lightweight construction essential to race applications. The swivel design accommodates slight misalignment and reduces stress on connected hose assemblies during engine vibration and thermal cycling—critical factors in turbocharged or nitrous-equipped powerplants. Anodized finish protects against oxidation in harsh engine compartment environments while maintaining a clean, professional appearance. This adapter meets AN (Army-Navy) standard specifications, ensuring compatibility with any properly fabricated AN hose or aftermarket fuel rail, intercooler line, or auxiliary cooling circuit.

Drag racers, street-rod builders, and EFI conversion specialists rely on this fitting when routing fuel systems or integrating auxiliary coolers into existing port configurations. Its compact footprint (1.95 x 0.85 x 2.75 inches) and minimal weight (0.03 lbs) make it ideal for tight engine bays where space and unsprung weight are critical. Installation is straightforward: thread the #4 AN female end into your component port and connect a #6 AN male hose fitting to the adapter outlet. For maximum longevity, apply appropriate thread sealant or PTFE tape to dry-break connections.