EVIL ENERGY 1/2" Heater Hose 5ft Black — SAE 20R3 EPDM, 100 PSI Working Pressure

EVIL ENERGY 1/2" Heater Hose is a 5-foot EPDM coolant hose built to SAE 20R3 specifications, rated for 100 PSI working pressure and designed for radiator, heater core, and overflow reservoir connections.

This heavy-duty straight heater hose delivers a reliable coolant pathway for automotive and small-engine cooling systems. Constructed from weather- and heat-resistant EPDM rubber, it withstands antifreeze and hot water while maintaining flexibility across a wide temperature span. Its dimensions and pressure ratings meet SAE 20R3 Class D-2 standards, making it suitable for replacement and retrofit applications where consistent flow and leak resistance are required.

How does this hose hold up to high temperatures and pressure?

The hose is rated to operate between -40°F and 257°F and has a working pressure of 100 PSI with a 300 PSI burst threshold. EPDM compound resists heat, steam, and common coolant chemistries, reducing degradation over time. The product meets SAE 20R3 Class D-2 specifications for wall construction and performance.

• Temperature range: -40°F to 257°F for broad compatibility
• Working pressure: 100 PSI; burst pressure: 300 PSI for safety margin
• Meets or exceeds SAE 20R3 standard for reliable wall strength

What are the exact size and fit details I should expect?

Inner diameter is 1/2" (13 mm) with a manufacturing tolerance of ±0.5 mm; outer diameter measures 0.78" (20 mm) with ±0.8 mm tolerance. The hose ships as a straight 5-foot length, allowing trimming to fit heater cores, radiator outlets, or overflow connections. A minimum bending radius of 104 mm helps maintain flow without kinking when routed correctly.

• ID: 1/2" (13 mm) ±0.5 mm for standard fittings
• OD: 0.78" (20 mm) ±0.8 mm for clamp and clearance planning
• Length: 5 feet, easy to cut to custom lengths
• Min bend radius: 104 mm to avoid collapse when routed

Which fluids and applications are suitable for this hose?

Manufactured from EPDM, the hose is compatible with coolant, water, antifreeze, and many automotive cooling fluids. Typical uses include heater core lines, radiator to overflow/expansion tank plumbing, and hot-water heater connections. It’s a versatile replacement hose for passenger cars, light trucks, and small engine systems where SAE 20R3 compliance is required.

• Compatible media: coolant, water, antifreeze
• Applications: heater hoses, radiator-to-reservoir lines, hot water heater plumbing
• Suitable for automotive and light industrial cooling systems

How should I install and maintain the hose for long service life?

Cut the hose squarely to length, use the correct-size clamps, and avoid sharp bends or contact with hot exhaust components. Inspect clamps and hose ends periodically for leaks or hardening, and replace if cracking or swelling appears. Proper routing and secure fastening extend service life and help prevent premature failure.

• Trim cleanly and use appropriately sized hose clamps
• Avoid contact with sharp edges and high-temperature surfaces
• Periodic inspection: check for stiffness, cracking, or seepage

Who is this for? EVIL ENERGY's 1/2" heater hose is aimed at DIY mechanics, repair shops, and fleet maintainers who need a durable, standards-compliant replacement hose for cooling and heater systems. If you require a flexible EPDM hose that fits standard 1/2" heater fittings, tolerates a wide temperature range, and meets SAE 20R3 wall specifications, this 5-foot hose offers a practical, serviceable solution. It’s especially useful when a longer single length is needed for routing or custom cuts rather than multiple shorter pieces.