Radiator Hose Reducer 1.75 to 1.5

The Radiator Hose Reducer 1.75 to 1.5 from ALLSTAR PERFORMANCE (SKU ALL 30240) is a precision hose adapter engineered for custom cooling system configurations where inlet and outlet diameters differ. Whether you're building a high-performance engine bay, adapting modern radiators to classic applications, or optimizing flow pathways in a tight engine compartment, this reducer bridges the gap between 1-3/4 inch and 1-1/2 inch ID (inside diameter) hose connections. Built from durable black rubber, it eliminates the need for awkward hose routing or expensive custom radiator modifications.

The stepped design allows smooth coolant transition from larger to smaller diameter passages, reducing turbulence and maintaining consistent flow rates through your cooling circuit. Constructed from quality rubber compound, this adapter resists thermal cycling, coolant chemical compatibility, and vibration stress—critical factors in sustained high-RPM or high-heat applications. The compact profile (3.5 x 2.05 x 4.35 inches) ensures fitment in space-constrained engine bays common to vintage restorations and modern swap builds. Its lightweight construction (0.08 lbs) adds negligible mass while offering reliable, leak-free connections when properly clamped with standard hose clamps.

Mechanics and enthusiasts favor this reducer for LS engine swaps, vintage Chevrolet and Ford restorations, and aftermarket radiator installations where OEM cooling lines are unavailable. Its rubber construction provides vibration isolation superior to rigid aluminum fittings, protecting against hose fatigue and clamp stress. Installation is straightforward—slide each hose end over the corresponding diameter boss and secure with dual hose clamps (not included) on both inlet and outlet sides. Compatible with all standard automotive coolant types and suitable for both street and race applications up to 16 PSI cooling system pressures.