4AN to 4AN(1/4)NPT Adapter 45

The REDHORSE PERFORMANCE 4AN to 4AN 1/4 NPT Adapter 45 Degree is a precision aluminum fitting engineered for high-pressure hydraulic, fuel, and pneumatic systems. This 45-degree adapter transitions from 4 AN male threads to 1/4 inch NPT male threads, enabling flexible plumbing layouts in tight engine bays, fuel systems, and aftermarket cooling circuits. The black anodized aluminum construction provides corrosion resistance and a durable finish suitable for both street and racing applications.

This 45-degree angle configuration reduces stress on connected lines compared to 90-degree adapters and allows cleaner routing around engine components. The 4AN size handles flow rates up to 500 PSI without compromise, making it suitable for fuel injection systems, boost lines, and custom cooling loops. The anodized finish resists oxidation in humid and salt-air environments, extending service life in applications exposed to moisture. At just 0.06 lbs, the compact 2.75 x 1.1 x 3.8-inch form factor fits into space-constrained installations without adding excess weight.

This adapter is ideal for fabricators, engine builders, and performance enthusiasts upgrading factory plumbing with -4 AN hardline systems. It solves the common problem of transitioning between modern AN-standard components and legacy or specialized NPT-threaded ports on headers, intercoolers, and factory connection points. OEM fuel system retrofits, turbocharger inlet modifications, and custom radiator installations frequently require this exact coupling solution. The precision machining and anodized finish ensure years of reliable service without leaks or thread galling.