If you manufacture your own aluminum radiator, the Mishimoto Aluminum Coolant Fill Neck is a must-have.The Mishimoto Aluminum Coolant Fill Necks are CNC machined and ready to be welded for use with your custom project.These Aluminum Fill Necks are compatible with our Mishimoto Radiator Caps.The small Mishimoto CNC machined Aluminum Fill Neck is 32mm and includes a screw-in nipple for overflow.

If you manufacture your own aluminum radiator, the Mishimoto Aluminum Coolant Fill Neck is a must-have.The Mishimoto Aluminum Coolant Fill Necks are CNC machined and ready to be welded for use with your custom project.These Aluminum Fill Necks are compatible with our Mishimoto Radiator Caps.The large Mishimoto CNC machined Aluminum Fill Neck is 42mm and includes a screw-in nipple for overflow.

Description: Weld On Radiator Filler Neck Inlet ID: 1.25in Inlet ID Metric: 31.8mm Material: 6061 Aluminum Alloy

Description: Weld On Radiator Filler Neck Inlet ID Metric: 41.9mm Inlet ID: 1.65in Material: 6061 Aluminum Alloy

Koyo 13-16 Scion FR-S / Subaru BRZ Aluminum Filler Neck

CNC machined Aluminum; Black anodized; Stainless steel hardware; Gasket included

This 360 degree swiveling fill neck bolts directly on to the Radium FCST at the 6-bolt fill neck location. Hose barb elbow will accept a 1.5" inside diameter hose. One-way flapper valve is included to prevent fuel back-flow in the event of a roll over.

Flexible fuel filler hose. 3 foot long, 1.5" inside diameter. T-bolt clamps included.