AN to O-Ring -4 x 3/8-24 (-3)

The AN to O-Ring -4 x 3/8-24 (-3) adapter from Triple X Race Components is a precision hydraulic and fuel line fitting designed for high-performance racing and motorsport applications. This straight adapter enables seamless connection between -4 AN male ports and 3 AN male O-ring ports, making it essential for builders who need flexible integration between different fluid system standards. Whether you're assembling a fuel delivery system, coolant circuit, or auxiliary hydraulic line, this adapter bridges incompatible connection types without sacrificing flow integrity or system reliability.

Constructed from aluminum and finished in black anodize, this fitting offers excellent corrosion resistance and a professional appearance in engine bays and fuel cells. The black anodized coating protects against oxidation while maintaining a clean aesthetic across custom builds. The -4 AN designation indicates a nominal bore diameter matched to -4 AN tubing and hose, while the 3/8-24 thread specification ensures compatibility with standard O-ring boss ports found on modern fuel rails, manifolds, and hydraulic blocks. Triple X Race Components manufactures this adapter to tight tolerances, ensuring reliable sealing and vibration resistance under demanding track conditions.

This adapter is ideal for fuel system upgrades, forced induction plumbing, and auxiliary cooling circuits in race cars, street performance vehicles, and marine applications. Installers benefit from the straightforward design—no elbow offsets or complex routing required—making it a drop-in solution for compact engine bays. Compatible with any system using -4 AN hard line or braided hose on one end and standard O-ring boss boss ports on the other, this fitting is a reliable choice for anyone building or modifying fluid delivery systems. Each adapter is sold individually, allowing you to purchase exactly the quantity needed for your project.