What Is a SAE J20 R3 Heater Hose?

The SAE J20 R3 is an industry-standard specification that defines performance requirements for Class D2 heater hoses. These hoses are:

– Made from EPDM rubber for excellent heat, ozone, and coolant resistance

– Reinforced with high-strength textile layers

– Capable of withstanding continuous temperatures up to +125°C

– Designed for long-term durability in engine compartments

Applications

– Passenger cars and trucks

– Buses and heavy-duty vehicles

– Agricultural and construction machinery

– HVAC systems in mobile units

Key Features of Arg Flex Car Heater Hoses

• Rated for up to +125°C continuous operation
• Weather-, ozone-, and coolant-resistant EPDM rubber
• Flexible and easy to route in tight engine bays
• Manufactured to meet SAE J20 R3 specifications
• Available in various inner diameters (6mm to 32mm)

Installation and Maintenance Tips

• Always use manufacturer-recommended hose clamps
• Avoid tight bends that may cause kinks or collapse
• Replace hoses showing signs of cracking, hardening, or swelling
• Perform periodic inspections, especially before seasonal changes

Why Choose Arg Flex Ltd?

At Arg Flex Ltd, we supply premium-quality car heater hoses that meet or exceed SAE J20 R3 standards. Whether you’re outfitting a single vehicle or maintaining a fleet, our hoses ensure reliability, performance, and long-term resistance to engine heat and chemical exposure.

Conclusion

Car heater hoses may be small components, but their role in engine cooling and passenger comfort is critical. Choosing Arg Flex Ltd’s SAE J20 R3-rated hoses guarantees top performance, even under the toughest automotive conditions.