These radiator necks from Aeroflow Performance are just what you need when making your custom radiator or header tank system. These radiators fill necks are CNC machined from 6061 aluminum. They feature a large diameter base which eliminates distortion when welding. A female NPT and barb fitting is included with each radiator neck. Available in two styles, large 42mm and small 32mm. Aeroflow Performance radiator caps are also available (sold separately).
• 1/8" NPT thread in neck.
• 4mm (5/32”) Barb Fitting included.