EVIL ENERGY 5/8" Heater Hose 5ft EPDM Coolant Radiator Hose — 100 PSI, SAE 20R3

EVIL ENERGY 5/8" Heater Hose is a 5-foot EPDM coolant hose engineered for engine cooling and heater systems, rated to 100 PSI and built to meet SAE 20R3 standards.

This heavy-duty heater hose is designed for circulating coolant and hot water in vehicles and heating systems. Constructed from EPDM rubber with class D-2 wall thickness, the hose combines high-temperature resistance, flexibility at low temperatures, and dependable pressure capacity to keep coolant pathways sealed and flowing under typical operating conditions.

What materials and specifications define this heater hose?

The hose uses durable EPDM rubber formulated for heat, ozone and coolant resistance. Key dimensional and performance specs give a clear picture of suitability for automotive and HVAC connections.

• Inner diameter (ID): 5/8" (16 mm) with ±0.5 mm tolerance
• Outer diameter (OD): 0.94" (24 mm) with ±0.6 mm tolerance
• Length: 5 feet (approx. 1.52 m)
• Working pressure: 100 PSI; burst pressure: 300 PSI
• Temperature range: -40°F to 257°F; minimum bending radius: 128 mm

How well does it handle heat, pressure, and common coolants?

Engineered to withstand typical engine bay and heater core environments, this hose tolerates elevated temperatures and repeated pressure cycles without rapid degradation. It is compatible with coolant, antifreeze and plain water used in closed cooling loops.

• Compatible media: coolant, antifreeze, and water
• Designed to operate up to 257°F and down to -40°F
• 100 PSI working pressure for steady system performance
• Meets SAE 20R3 Standard Wall Class D-2 requirements for reliability

Where and how should this hose be installed and used?

This hose connects radiator, heater core, and overflow or reservoir lines and suits most passenger vehicle and light commercial cooling circuits. Install with proper clamps, avoid sharp bends tighter than the minimum bend radius, and confirm clamp placement to prevent leaks.

• Common uses: heater core lines, radiator-to-reservoir connections, and coolant bypass loops
• Use recommended hose clamps sized to 5/8" ID to ensure sealing
• Maintain bend radius ≥128 mm to prevent kinking
• Trim cleanly and deburr ends before fitting to preserve seal integrity

How long can I expect this hose to last and how do I maintain it?

Service life depends on operating conditions, but EPDM compounds resist heat, ozone, and coolant additives for extended durability when installed correctly. Routine inspections for soft spots, cracks, leaks, and clamp corrosion will help you catch wear early and replace the hose before failure.

• Inspect periodically for swelling, cracks, or hardening
• Replace when signs of wear appear or during major cooling system service
• Store away from direct sunlight and ozone sources to preserve rubber properties
• Use proper clamps and avoid overtightening to prevent localized damage

Who this hose is for: installers, mechanics and DIY vehicle owners looking for a reliable replacement or service hose for coolant and heater lines. If you need a 5/8" ID hose that balances temperature tolerance, pressure capacity, and flexibility for passenger cars, light trucks, or heating applications, the EVIL ENERGY 5/8" Heater Hose offers a cost-effective, standards-compliant option built from EPDM rubber for long-term performance.