4 Ft. Class B Tube Heavy Duty Radiator Hose with 4" Inside Dia., Black/Gold

These nitrile SAE 20R2 Class B radiator and coolant hoses meet SAE (Society of Automotive Engineers) Standard 20R2. They are used for routing coolant in heavy-duty trucks where the hoses must make multiple bends or bends with small radiuses. The hoses have single-ply fabric reinforcement over a fully embedded helical steel wire, which strengthens the hoses and allows them to resist kinking and avoid collapsing under vacuum. The hoses have a neoprene cover that provides low (Class C) oil resistance, and they have a nitrile tube that provides good (Class B) oil resistance.

Radiator and coolant hoses carry coolant from a vehicle's radiator to its engine to cool the engine and prevent overheating and vehicle malfunction. They also transport hot coolant from a vehicle's engine to its radiator, where the coolant is cooled for recirculation. Also known as antifreeze hoses, coolant lines, and coolant tubing, these hoses are made from materials that can withstand exposure to the chemicals and additives used in vehicle cooling systems.