Endura Adapter Fitting #4 to 1/8 NPT 90 Degree

The Russell Endura Adapter Fitting #4 to 1/8 NPT 90 Degree is a precision-engineered hose coupling solution designed for custom fuel, oil, and coolant line routing in performance and modified vehicles. This 90-degree adapter bridges two different port sizes and thread types, making it essential for builders working with non-OEM fuel injection systems, turbo kits, custom cooling loops, and aftermarket engine management setups.

Whether you're fabricating a fuel system from scratch or adapting legacy components to modern platforms, this fitting provides the critical size and angle transition your build demands. Russell's Endura line represents hose and fitting technology optimized for high-vibration automotive environments where reliability cannot be compromised. The #4 JIC (AN) male end connects to standard -4 hose or adapters common in racing and performance fuel systems, while the 1/8 NPT female port accommodates brass or steel fittings typically found on fuel regulators, pressure sensors, and block ports.

The 90-degree configuration eliminates sharp bends in hose runs, reducing fatigue at connection points and improving flow characteristics—critical when fuel delivery consistency affects engine tune and response. Precision machining and thread accuracy ensure leak-free seals across temperature and pressure cycling. This adapter is ideal for EFI conversions, turbocharged engine swaps, and fuel system upgrades where factory port locations and sizing don't align with aftermarket components.