Endura Coupler Fitting #6 90 Degree

The RUSSELL Endura Coupler Fitting #6 90 Degree (MPN 640161) is a precision hydraulic and fuel line adapter engineered for high-pressure fluid transfer applications in racing, marine, and industrial systems. This 90-degree swivel coupling connects two 6 AN female ports with unrestricted flow geometry, enabling quick repositioning of hoses in tight engine bays and equipment layouts where straight-line routing is impossible.

Constructed from aluminum and finished with nickel anodization, this fitting resists corrosion from fuel, coolant, and saltwater exposure while maintaining a lightweight profile—critical for weight-sensitive applications like motorsports and offshore equipment. The 6 AN specification accommodates flows up to approximately 100 GPM at typical racing fuel system pressures, making it suitable for carbureted engines, EFI systems, and auxiliary cooling circuits. The swivel design on both ports allows hose terminations to rotate freely during assembly and service, reducing thread stress and preventing cross-threading—a practical advantage during maintenance or hose replacement in confined spaces.

This adapter is essential for enthusiasts building custom fuel systems, restoring vintage race vehicles, or upgrading cooling and hydraulic circuits where directional changes are required. It pairs seamlessly with braided stainless steel hose, AN fittings, and standard hydraulic components in both street and competition applications. Its compact dimensions (2.6 x 1.65 x 5.65 inches) fit behind firewalls and between engine accessories where standard straight adapters cannot.

RUSSELL is recognized in the automotive and marine industries for precision-engineered fittings that meet SAE J518 standards, ensuring compatibility across OEM and aftermarket systems. This individual coupler allows builders to customize hose runs without purchasing pre-assembled assemblies, reducing waste and expense on specialized builds.