4AN PTFE Hose Ends Black STR

The REDHORSE PERFORMANCE 4AN PTFE Hose Ends Black STR is a straight adapter fitting designed for high-performance fuel, coolant, and fluid transfer systems in custom automotive builds. Whether you're fabricating a fuel system for a race engine, installing a turbo boost circuit, or upgrading your vehicle's cooling lines, these hose ends are essential for creating leak-free, vibration-resistant connections.

Engineered with a PTFE (polytetrafluoroethylene) core lining, the 4AN straight hose end resists degradation from fuel additives, extreme temperatures, and aggressive coolant formulations that standard rubber hose cannot tolerate. The black-anodized aluminum body provides corrosion resistance and a clean, race-spec appearance under the hood, while the straight configuration eliminates the need for additional elbows and reduces flow restrictions in tight engine bay layouts.

This fitting is ideal for fuel system builders, engine swap specialists, and anyone upgrading to braided stainless steel AN hose assemblies. The swaged design ensures a permanent, pressurized connection that won't separate under boost or sustained high-flow conditions—critical for turbo systems and supercharged platforms where hose failure means catastrophic engine damage.