4AN Weld-On Flange Adapt Male Clear

The 4AN Weld-On Flange Adapt Male Clear by REDHORSE PERFORMANCE is a precision-engineered hydraulic fitting adapter designed for high-performance fuel, oil, and coolant systems in motorsports and industrial applications. This weld-on bung fitting serves as a critical connection point in custom fuel systems, turbo setups, and engine modifications where reliability and leak-free operation are non-negotiable. Built to meet the demanding standards of serious enthusiasts and professional builders, this adapter eliminates the need for costly fabrication while maintaining system integrity under pressure.

Machined from lightweight aluminum with a natural finish, the 4AN Weld-On Flange Adapt Male Clear features a 4 AN male thread port that accepts standard -4 hose fittings and braided lines. The weld-on flange design allows direct integration into fuel tanks, radiators, or custom manifolds through permanent welding, creating a structurally sound interface that won't loosen or vibrate free under extreme conditions. The clear anodized coating provides corrosion resistance while maintaining visibility of the fitting interior—a critical advantage when troubleshooting fuel flow issues or inspecting system cleanliness. Weighing just 0.05 lbs, this compact adapter (2.8 x 1.1 x 3.8 inches) integrates seamlessly into space-constrained engine bays.

Professional engine builders, fuel system installers, and performance tuners rely on REDHORSE 971 Series bungs for custom fuel rails, surge tanks, and intercooler circuits where off-the-shelf solutions fall short. This male adapter is ideal for applications requiring a fixed mounting point with rotatable hose connection—common in turbocharged builds, LS engine swaps, and vintage restorations. Installation demands TIG welding equipment and proper preparation of the mounting surface; the resulting joint is stronger than the surrounding material. Verify tank or manifold material compatibility (aluminum, steel) and consult system pressure ratings before installation to ensure safe operation across your complete hydraulic circuit.