EVIL ENERGY 5/8" Heater Hose 25 ft EPDM Coolant Radiator Hose — SAE 20R3, 100 PSI

EVIL ENERGY 5/8" heater hose is a 25-foot EPDM coolant hose built to SAE 20R3 standards for engine and heater coolant lines, rated for 100 PSI working pressure and −40°F to 257°F temperature range.

This 5/8-inch (16 mm) inner-diameter radiator/heater hose delivers a long, flexible length for routing coolant, antifreeze or hot water in automotive and light industrial applications. Constructed from durable EPDM rubber, the hose is designed to meet SAE 20R3 Standard Wall Class D-2 requirements and offers a balance of temperature tolerance, pressure capability and bendability for clean installations between radiators, heater cores and overflow tanks.

How does this hose handle engine heat and cold starts?

The EPDM compound used in the EVIL ENERGY hose resists temperature extremes and thermal cycling without cracking or softening. Its rated temperature window from −40°F to 257°F covers cold starts and normal cooling-system operating temperatures in most gasoline and diesel vehicles.

• Temperature range: −40°F to 257°F for broad climate performance
• Material: EPDM rubber resists heat aging and ozone
• Meets SAE 20R3 Standard Wall Class D-2 for thermal durability

Will it withstand system pressure and sudden surges?

This hose is specified with a 100 PSI working pressure and a 300 PSI burst pressure, providing a safety margin for typical cooling system pressures and brief pressure spikes. The construction reduces the risk of leak or rupture when used within recommended limits.

• Working pressure: 100 PSI for continuous use
• Burst pressure: 300 PSI for increased safety margin
• Manufactured to tolerances to ensure consistent wall thickness and performance

What sizes and fittings are compatible for my vehicle?

The hose has an inner diameter of 5/8" (16 mm) and an outer diameter of 0.94" (24 mm), with manufacturing tolerances to maintain reliable fits with common clamps and connectors. Its 25-foot length lets you cut custom sections for heater cores, bypass lines, overflow connections, or replacement runs without seams.

• ID: 5/8" (16 mm) ±0.5 mm for standard clamp compatibility
• OD: 0.94" (24 mm) ±0.6 mm for selection of hose clamps and fittings
• Length: 25 ft to supply multiple cuts or long routing paths

How easy is installation and what applications is it suited for?

The hose’s flexibility and minimum bending radius make routing and clamping fast, while EPDM’s compatibility with coolant and antifreeze simplifies system fluid choices. Installers can trim to length and secure with standard worm-drive or spring clamps for heater cores, radiator return lines or overflow tank connections.

• Min bending radius: 128 mm to avoid kinks when routed
• Compatible media: coolant, water, antifreeze, and similar fluids
• Common uses: hot water heater lines, engine cooling circuits, radiator-to-overflow connections

Who this product is for: EVIL ENERGY 5/8" heater hose is aimed at DIY mechanics, professional technicians and fleet maintenance teams who need a reliable, standards-compliant replacement or custom-length coolant line. If you require a long, versatile section of EPDM hose to rebuild heater panels, extend radiator plumbing, or stock a parts bench for multiple vehicle models, this 25-foot hose balances durability, temperature and pressure performance with straightforward installation.