Radiator Inlet Fitting 1-5/8in x 1-1/2in

The Northern Radiator Radiator Inlet Fitting 1-5/8in x 1-1/2in (SKU NRAZ17548) is a precision aluminum adapter engineered to connect O-ring male inlet ports to standard hose barb outlets in automotive cooling systems. This straight-design fitting delivers a secure, leak-resistant connection essential for maintaining coolant flow integrity in high-temperature engine environments.

The 1-5/8-inch male O-ring end mates directly with factory or aftermarket radiator inlets, while the 1-1/2-inch hose barb accommodates standard coolant hose diameters. Aluminum construction provides excellent thermal conductivity and corrosion resistance compared to brass alternatives, critical for vehicles exposed to salt air, prolonged moisture, or aggressive coolant formulations. The natural finish resists oxidation in typical engine bay conditions. At 0.12 lbs, the fitting adds negligible weight while maintaining the dimensional precision required for proper sealing and hose retention.

This adapter is ideal for custom radiator installations, cooling system repairs, and engine swaps where OEM inlet fittings require replacement or modification. Buyers undertaking radiator upgrades, performance cooling builds, or vehicle restoration projects rely on this fitting to eliminate leaks and restore reliable temperature control. It's a critical component for anyone rebuilding or reconfiguring a vehicle's cooling circuit with aftermarket or repositioned radiators.

Northern Radiator is recognized in the automotive cooling market for producing durable, precision-engineered fittings and components that meet OEM tolerances and reliability standards. This straight fitting ensures a direct, no-angle connection—essential in tight engine bay layouts where bent adapters create clearance or hose-routing conflicts.