EVIL ENERGY 3/8" Heater Hose 10FT Coolant Radiator Hose

EVIL ENERGY 3/8" heater hose is a 10-foot EPDM coolant hose kit built to SAE 20R3 standards, rated for 100 psi working pressure and supplied with ten stainless clamps for ready installation.

This heater hose kit combines a flexible EPDM rubber tube with factory-rated pressure and temperature tolerances so you can replace worn coolant, heater, or overflow lines with confidence. The hose measures 3/8 inch (9.5 mm) inside diameter and 5/8 inch (16 mm) outside diameter, with a 10-foot length that covers most routing needs in cars, trucks, and small engines. It is designed for coolant, antifreeze, and water circuits and includes ten clamps sized to secure the hose to barbs and fittings.

How does this hose meet automotive cooling system standards?

The EVIL ENERGY heater hose is manufactured from EPDM rubber and engineered to meet SAE 20R3 specifications, ensuring the wall thickness and material resilience match common OEM expectations. Temperature and pressure ratings are provided so you can match the hose to your vehicle's operating range.

• Meets/exceeds SAE 20R3 Standard Wall Class D-2 thickness.
• Working pressure: 100 psi; burst pressure: 300 psi for safety margin.
• Temperature range: -40°F to 257°F for cold-start and high-heat stability.
• Min bending radius: 76 mm to avoid kinking during installation.

Will this hose work for my coolant, heater, or overflow lines?

Yes — the hose is compatible with coolant, antifreeze, and water, making it suitable for heater cores, radiator-to-overflow connections, and many other cooling system runs. The 3/8" ID is common for heater hoses and small-diameter circuits, but confirm your vehicle's required inner diameter before replacing.

• Inner diameter: 3/8" (9.5 mm) with ±0.4 mm tolerance for reliable fit.
• Outer diameter: 5/8" (16 mm) with ±0.5 mm tolerance for clamp compatibility.
• 10-foot length: long enough for multiple runs or future spares.
• Includes 10 clamps sized to fit the hose securely on fittings.

How durable is the hose under pressure, heat, and bending?

This EPDM hose is formulated for durability in automotive environments, with a burst pressure substantially higher than the working pressure to reduce failure risk. The specified minimum bending radius helps installers route the hose without sharp bends that reduce flow or cause premature wear.

• EPDM construction resists heat, steam, and coolant chemicals.
• Rated working pressure of 100 psi; burst at 300 psi for safety buffer.
• Temperature tolerance from -40°F to 257°F for thermal reliability.
• 76 mm minimum bending radius to maintain flow and prevent kinks.

Who this is for: This EVIL ENERGY kit is suited to DIY mechanics, professional technicians, and vehicle owners who need a reliable replacement for heater or small coolant hoses. It's useful when upgrading aged or cracked lines, creating custom coolant plumbing, or stocking a repair kit for small engines and passenger vehicles. Verify your vehicle's hose diameter and routing needs before purchase to ensure a proper fit.