
The Dayco 86121 Molded Heater Hose is a premium-quality replacement designed to restore your vehicle's heating system to optimal performance. Made from a durable knitted polyester and an EPDM rubber compound, this hose offers the perfect balance of flexibility and strength for long-lasting use. Engineered to meet SAE J20R4 and SAE J1684 specifications, it ensures superior resistance to electro-chemical degradation, preventing premature stress cracking. The OE-style hose bends provide a direct, seamless replacement for your old or damaged heater hose, ensuring a precise fit and easy installation. Built to withstand fluids and extreme temperature variations, the Dayco 86121 ensures reliable performance and durability in even the harshest conditions.
Key Features:
- Direct replacement for broken or collapsed heater hoses, ensuring a precise fit
- Meets SAE J20R4 and SAE J1684 specifications for durability and electro-chemical resistance
- Resists stress cracking, ensuring long-term, reliable performance
- Withstands fluid exposure and extreme temperatures for consistent use
- Knitted polyester and EPDM rubber construction for flexibility and strength
Keep your vehicle’s heating system in top condition with the high-performance Dayco 86121 Molded Heater Hose, built for lasting reliability.

The Dayco 86121 Molded Heater Hose is a premium-quality replacement designed to restore your vehicle's heating system to optimal performance. Made from a durable knitted polyester and an EPDM rubber compound, this hose offers the perfect balance of flexibility and strength for long-lasting use. Engineered to meet SAE J20R4 and SAE J1684 specifications, it ensures superior resistance to electro-chemical degradation, preventing premature stress cracking. The OE-style hose bends provide a direct, seamless replacement for your old or damaged heater hose, ensuring a precise fit and easy installation. Built to withstand fluids and extreme temperature variations, the Dayco 86121 ensures reliable performance and durability in even the harshest conditions.
Key Features:
Direct replacement for broken or collapsed heater hoses, ensuring a precise fit
Meets SAE J20R4 and SAE J1684 specifications for durability and electro-chemical resistance
Resists stress cracking, ensuring long-term, reliable performance
Withstands fluid exposure and extreme temperatures for consistent use
Knitted polyester and EPDM rubber construction for flexibility and strength
Keep your vehicle’s h[...]
The Dayco 86121 Molded Heater Hose is a premium-quality replacement designed to restore your vehicle's heating system to optimal performance. Made from a durable knitted polyester and an EPDM rubber compound, this hose offers the perfect balance of flexibility and strength for long-lasting use. Engineered to meet SAE J20R4 and SAE J1684 specifications, it ensures superior resistance to electro-chemical degradation, preventing premature stress cracking. The OE-style hose bends provide a direct, seamless replacement for your old or damaged heater hose, ensuring a precise fit and easy installation. Built to withstand fluids and extreme temperature variations, the Dayco 86121 ensures reliable performance and durability in even the harshest conditions.
Key Features:
- Direct replacement for broken or collapsed heater hoses, ensuring a precise fit
- Meets SAE J20R4 and SAE J1684 specifications for durability and electro-chemical resistance
- Resists stress cracking, ensuring long-term, reliable performance
- Withstands fluid exposure and extreme temperatures for consistent use
- Knitted polyester and EPDM rubber construction for flexibility and strength
Keep your vehicle’s heating system in top condition with the high-performance Dayco 86121 Molded Heater Hose, built for lasting reliability.