Radiator Hose Fitting 1.75in to 16an ORB

The Holley radiator hose fitting 1.75in to 16an ORB is a precision adapter designed for custom cooling system plumbing in high-performance automotive applications. This straight-port fitting bridges two common industry standards—1.75-inch barbed hose connections and 16 AN O-ring boss ports—making it essential for builders upgrading radiator systems or engine swaps.

Manufactured from aluminum and finished in natural (uncoated) form, the FB402 features a robust O-ring sealed design that prevents coolant weeping under pressure and thermal cycling stress. The 16 AN male threads accept standard O-ring fittings, while the 1.75-inch barbed end securely grips reinforced radiator hose using a standard worm-drive or band clamp. This fitting's straight configuration minimizes flow restriction and simplifies tight engine bay routing.

Professional engine builders and cooling system fabricators benefit most from the Holley radiator hose fitting 1.75in to 16an ORB, as it ensures secure, leak-free connections between incompatible component sizes. Its compact footprint and light weight make it ideal for space-constrained installations, providing excellent thermal conductivity and corrosion resistance in glycol-based coolant environments.