AN To NPT Straight -4 x 1/4in

The ALLSTAR PERFORMANCE AN to NPT Straight -4 x 1/4in adapter (ALL 49506) is a precision hydraulic and pneumatic fitting designed to connect AN-spec male ports to NPT male threaded systems. This straight adapter consolidates two industry-standard connection types in a single compact component, eliminating the need for multiple adapters in applications ranging from fuel systems and transmission cooling to brake lines and custom hydraulic circuits.

Constructed from aluminum and finished in black anodized coating, this fitting offers corrosion resistance and lightweight integration into high-performance systems. The -4 AN port (nominally 0.25 inches ID) pairs with 1/4 inch NPT male threading, making it compatible with standard NPT-threaded ports found in manifolds, gauges, and reservoir fittings. The straight configuration ensures direct flow path without bends, reducing pressure drop and simplifying installation in space-constrained engine bays and chassis.

This adapter is essential for builders integrating modern AN-plumbed fuel systems into older platforms still using NPT fittings, or for hybrid builds combining components from different eras. Drag racing, hot rod, and custom truck applications frequently require these cross-compatible fittings to bridge OEM and aftermarket system standards. The black anodized finish resists oxidation in engine compartments while maintaining a professional appearance under the hood.

Weighing just 0.04 pounds, this single-unit fitting adds negligible mass to a system while delivering the thread-seal reliability of tapered NPT connections. Whether upgrading fuel delivery, brake circuits, or custom cooling loops, AN-to-NPT adapters are fundamental components for any serious performance or restoration project requiring flexible, standards-compliant connections.