SpeedFactory Racing Honda/Acura D-Series Upper Coolant Fill Neck

Whether you have a custom radiator or a SpeedFactory Race/Tucked radiator, you need a proper way to fill your engine's cooling system from the highest point- and we have the solution.

SpeedFactory Racing D-Series Upper Coolant Fill Necks are compatible with most aftermarket radiator setups, and change the high point of your cooling system for easy filling and system air bleeding. Our necks are manufactured in-house using high quality aluminum materials and feature laser-cut head flanges to ensure a perfect fit every time.

SpeedFactory Racing D-Series Upper Coolant Fill Necks are available in -16AN or 32mm (standard hose end) configurations.

Fits D16 engines.

**Note** The OEM Upper Coolant Neck flange bolts are NOT compatible with this fill neck. We recommend M6 x 1.0 x 16mm button head socket cap screws.

This fill neck requires a TYPE A Style Radiator Cap (Sold Separately), Available HERE!