The Aeroflow AF64-4039BLK Billet Inline Radiator Hose Filler is engineered for high-performance cooling setups where a traditional filler neck location isn’t possible.

Machined from billet aluminium, this unit includes a black anodized finish for corrosion resistance and a sleek appearance. It accepts standard 38mm radiator caps and features 1-1/4"-20 internal thread, making it suitable for a range of custom and race applications.

Install it inline on any 1-1/2” radiator hose to simplify bleeding and filling of coolant systems where the radiator is lower than the engine.

Key Features:

• CNC-Machined Billet Aluminium – Lightweight, strong, and resistant to corrosion

• Black Anodized Finish – Sleek, durable coating for aesthetics and protection

• Fits 38mm Radiator Caps – Compatible with standard radiator pressure caps

• 1-1/4"-20 Internal Thread – Allows easy cap fitment and seal integrity

• 1-1/2” Hose Compatibility – Installs inline on common radiator hose sizes

• Perfect for Custom & Race Applications – Ideal for setups where radiator is lower than engine