Dayco 72406 Radiator Coolant Hose - Lower

Dayco Curved Radiator Hose for Nissan Altima

The Dayco 72406 curved radiator hose is a lower coolant hose built for 2007-2018 Nissan Altima applications. Made from EPDM rubber and finished in black, it follows the routing needed for a clean, OE-style coolant connection in the engine bay.

Dayco’s Curved Radiator Hose line focuses on application-specific hose shape and material selection for reliable coolant transfer. This hose is formed as a single I.D. hose with matching 1 11/32-inch inside diameters at both ends, helping it align with the factory cooling system layout on the Nissan Altima.

Key Features

• Part number: 72406
• Curved lower radiator hose for Nissan Altima
• EPDM construction for coolant-system use
• Black finish
• Single I.D. hose design
• End 1 inside diameter: 1 11/32 in.
• End 2 inside diameter: 1 11/32 in.
• End 1 outside diameter: 1 5/8 in.
• End 2 outside diameter: 1 5/8 in.
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Product Details

This Dayco radiator coolant hose is engineered for the lower position on 2007-2018 Nissan Altima models. The curved profile supports the factory hose path, while the EPDM material is commonly used in cooling-system service for its resistance to heat and coolant exposure. If you are replacing a worn lower hose on a Nissan Altima, Dayco 72406 provides the correct shape and sizing for the application.

This part cross-references Datsun/Nissan 21503-JA000 and Gates 23345 for the same application. It also aligns with other interchange references including ACDelco 26594X, CARQUEST 23345, Duralast E72406, Goodyear 66222, and NAPA 16083 / 21503-3TA0A.

Common Cooling System Issues

• Cracked or split lower radiator hose
• Coolant leaks at the hose connection points
• Soft, swollen, or deteriorated hose material
• Restricted coolant flow from a damaged hose
• Incorrect hose shape after prior repair work

Installation Notes

Verify hose routing and end diameters before installation on the vehicle. Inspect the mating necks, clamps, and nearby cooling-system components for wear or corrosion before installing the new hose. This hose does not contain a heat shield or protective sleeve.

Fits 2007-2018 Nissan Altima, lower.

Quality Assurance

Dayco manufactures this hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for radiator hose applications. The specified EPDM construction and application-specific curved design support proper fitment in the cooling system.