4AN 45 Degree PTFE Reusable Hose End Black

The 4AN 45 Degree PTFE Reusable Hose End Black from REDHORSE PERFORMANCE is a precision-engineered fitting designed for custom fuel, oil, and coolant line applications in modified vehicles and high-performance engine builds. This hose end serves as the critical connection point between braided stainless steel hose and your engine bay plumbing, allowing you to route lines around tight engine compartments without kinking or restricting flow. Whether you're upgrading to a turbo system, installing a remote oil cooler, or running a custom fuel system on your street rod or race car, this reusable fitting eliminates the guesswork of proprietary hose assemblies.

The 45-degree angle design allows flexible routing in cramped engine bays while maintaining optimal flow dynamics and reducing stress on hose connections under pressure and vibration. PTFE (polytetrafluoroethylene) sealing material provides superior chemical resistance to modern fuels, synthetic oils, and aggressive coolants without degradation, ensuring leak-free performance across a wide temperature range. The black anodized aluminum body resists corrosion from road salt and engine bay humidity, while the reusable design lets you assemble or disassemble lines multiple times without replacing the fitting itself—a major advantage over disposable crimped ends when tuning systems or troubleshooting plumbing layouts.

Mechanics and fabricators favor REDHORSE fittings for custom fuel injection retrofits, forced induction builds, and motorsports applications where reliability and adjustability matter most. The 4AN size (common on modern turbo and supercharger kits) mates with standard -4 braided hose and accommodates male JIC fittings on the hose barb end. Installation requires only a wrench and basic assembly knowledge—tighten the fitting onto your hose barb until snug, then connect to your system or component port. Stock this fitting in your build kit whenever you're designing custom engine cooling, fuel delivery, or oil circulation lines on any platform from LS and small-block Chevy to Ford modular and aftermarket engine swaps.