Radiator Overflow Fitting -4an

The Radiator Overflow Fitting -4AN from JOES RACING PRODUCTS is a precision-engineered coolant system component designed for performance-oriented vehicles and high-output engine builds. This fitting serves as the critical connection point between your radiator overflow tank and the main cooling circuit, allowing pressurized coolant to flow safely during thermal expansion while preventing air ingestion and coolant loss. Whether you're running a naturally aspirated build or a turbocharged platform, proper overflow management is essential to maintaining stable coolant temperatures and protecting your investment.

This -4AN (negative 4 AN, equivalent to 1/4-inch hose diameter) fitting accommodates standard -4 braided coolant lines, making it compatible with both OEM and aftermarket radiator configurations. The compact design—measuring just 3.05 by 0.75 by 3.45 inches and weighing only 0.03 lbs—minimizes packaging constraints in tight engine bays while maintaining robust flow capacity. JOES RACING PRODUCTS manufactures this component to withstand elevated pressures common in modified cooling systems, ensuring reliable operation under sustained track use or street performance conditions without weeping or connection failure.

Custom engine builders, drag racing enthusiasts, and street performance tuners rely on JOES RACING fittings to eliminate cooling system weak points during high-heat operation. This fitting integrates seamlessly into custom radiator hose routing during engine bay reorganization, allowing you to position your overflow tank for optimal clearance and accessibility. Installation requires standard -4AN hose and compatible fittings; always verify your complete cooling loop specifications and pressure rating before final assembly to ensure all components operate within their design envelope.