Radiator Inline Filler 1.5in Hose to 1.5in Hose

The HOWE Radiator Inline Filler 1.5in Hose to 1.5in Hose (Model 3423) is a precision aluminum filler neck assembly engineered for direct integration into vehicle cooling systems. This hose-mount radiator filler provides a seamless connection point for adding coolant without requiring adapter fittings, maintaining system integrity through matched 1.5-inch hose ports on inlet and outlet sides.

Constructed from durable aluminum, this inline filler neck is designed for reliability in high-demand cooling applications where quick, reliable coolant access is essential. The symmetric 1.5-inch hose-to-hose configuration eliminates port mismatch issues and reduces potential leak points at connection interfaces. At just 0.3 lbs, the compact footprint (2.8 x 2.3 x 7.05 inches) allows flexible mounting in constrained engine bays typical of performance vehicles, marine engines, and custom cooling systems. HOWE's manufacturing standard ensures consistent thread engagement and pressure-rated sealing surfaces.

This filler neck is ideal for builders and technicians upgrading or servicing closed-loop cooling systems where OEM fill caps are inaccessible or inadequate. Drag racing, off-road, marine, and engine-swapped vehicles benefit from dedicated inline filler placement that improves maintenance accessibility and system burping capability. The aluminum construction resists corrosion, though periodic inspection of hose clamp security ensures long-term reliability under thermal cycling.

For applications requiring matching 1.5-inch hose ports without step-down adapters, HOWE's inline filler delivers a factory-quality solution at competitive pricing. Verify hose diameter compatibility with your system before ordering to ensure proper fit and sealing performance.