AN to O-Ring -4 x 3/4-16 (-8)

The AN to O-Ring -4 x 3/4-16 (-8) adapter from Triple X Race Components is a straight-flow hydraulic and pneumatic fitting engineered for high-performance racing and motorsport fuel, oil, and coolant systems. This adapter bridges AN -4 (5/16" SAE) male ports to AN -8 (1/2" SAE) male O-ring ports, making it essential for custom fuel injection tuning, nitrous oxide delivery systems, and precision engine plumbing where port size transitions are required without restrictive elbows or bends.

Constructed from lightweight aluminum and finished in durable black anodizing, this fitting resists corrosion and heat damage while maintaining a clean aesthetic in engine bays and fuel cells. The 3/4-16 thread specification provides a secure seal compatible with standard O-ring adapters, while the straight configuration ensures zero flow deflection—critical for maintaining fuel pressure stability and preventing cavitation in high-RPM applications. Black anodizing offers both UV and thermal protection, extending service life in extreme underhood environments.

This adapter is ideal for fabricators, engine builders, and motorsport enthusiasts building custom fuel systems, intercooler loops, and boost plumbing on turbocharged and supercharged platforms. It pairs seamlessly with Aeromotive, Holley, and other modular fuel system components where AN port standardization simplifies assembly and leak-free operation. Compact dimensions (1.95 × 0.95 × 2.75 inches) and lightweight construction (0.03 lbs) make installation straightforward in tight engine compartments without adding significant weight or complexity to fuel and coolant architectures.