Weld On Radiator Filler Neck - 32mm ID (1.25in)

The Weld On Radiator Filler Neck - 32mm ID (1.25in) from VIBRANT PERFORMANCE is a precision-engineered component designed for builders and mechanics who demand custom cooling system integration. This universal aluminum filler neck serves as a direct replacement or custom installation point for radiator systems requiring a secure, welded connection rather than a threaded bung. Whether you're fabricating a custom cooling loop, converting to a modern radiator setup, or restoring a classic build without factory filler provisions, this weld-on design eliminates reliance on temporary or unreliable quick-connect solutions.

Constructed from lightweight aluminum and finished in natural (bare) form for optimal weldability, the Weld On Radiator Filler Neck features a 32mm (1.25-inch) inside diameter opening compatible with standard overflow hoses and coolant caps. The design includes a 1/16-inch NPT port for vacuum or pressure relief venting and a 5/16-inch hose barb fitting for auxiliary cooling line routing or surge tank connections. This combination of ports ensures proper coolant circulation and system pressure regulation without compromising structural integrity. The compact 3.55 x 0.85 x 6.2-inch profile fits tight engine bay installations, while the all-aluminum construction resists corrosion and remains lightweight—critical advantages in performance and custom applications.

Mechanics and fabricators benefit from this component when building engine swaps, upgrading cooling systems on older vehicles, or designing custom radiator installations where standard NPT or push-on connections aren't viable. The weld-on mounting method delivers a permanent, vibration-proof seal far superior to compression fittings in high-performance or extreme temperature environments. Installation requires basic welding skills and proper heat management to prevent aluminum warping, making it ideal for shop builds or experienced DIY enthusiasts. This universal design integrates into virtually any radiator configuration, from street rods and race cars to truck restorations and marine cooling systems.