Vibrant Weld On Radiator Filler Neck - 42mm ID (1.65in)

CNC machined from 6061 aluminum alloy, this Vibrant Performance radiator filler neck features a 42mm (1.65 inch) inner diameter. It’s designed to be welded onto a custom radiator or expansion tank, giving you a clean and secure point to fill your cooling system. The included barbed nipple is handy for connecting a hose to an expansion tank, helping to manage coolant overflow and maintain proper system pressure.

This filler neck is a solid choice for custom builds where factory components won't fit or when you're fabricating a new cooling system. It’s compatible with Vibrant Performance high-pressure aluminum radiator caps, ensuring a tight seal. If you need to replace the barb fitting, part number 11642F is available.