EVIL ENERGY 3/4" Heater Hose 15ft Black EPDM 100psi SAE 20R3 — Flexible Radiator/Coolant Line

EVIL ENERGY's 3/4" heater hose is a 15-foot EPDM coolant hose built to SAE 20R3 standards, rated for 100psi working pressure and wide temperature extremes for reliable engine cooling connections.

Designed for automotive and industrial cooling systems, this straight 3/4" (19mm ID) heater hose provides a durable, flexible link between radiators, heater cores, and overflow reservoirs. Rolled in a black EPDM compound, it resists heat, aging, and common coolant mixtures while meeting SAE 20R3 Standard Wall Class D-2 requirements for safety and performance.

How does this hose stand up to heat and pressure?

The EVIL ENERGY heater hose is rated to operate from -40°F up to 257°F and has a working pressure of 100psi with a 300psi burst rating. That specification means it can tolerate everyday engine temperatures and common pressure spikes without failing.

• Temperature range: -40°F to 257°F for hot and cold climates
• Working pressure: 100psi, burst pressure: 300psi
• Manufactured to exceed SAE 20R3 Standard Wall Class D-2

Will this hose fit my vehicle’s cooling system connections?

This hose has a nominal inner diameter of 3/4" (19mm) and an outer diameter of 1.10" (28mm), with tolerances that help ensure a snug fit with common clamps and fittings. The 15-foot length allows you to cut to size for single or multiple runs, and the 152mm minimum bending radius lets you route it around components without kinking.

• Inner diameter: 3/4" (19mm) ±0.6mm for consistent fit
• Outer diameter: 1.10" (28mm) ±0.8mm for clamp compatibility
• Length: 15 feet — easy to trim to required lengths
• Min bending radius: 152mm to prevent kinks

What fluids and environments is the hose compatible with?

Constructed from EPDM rubber, this hose is formulated to resist degradation from coolant, water, antifreeze, and similar engine fluids. It also resists ozone, heat aging, and many common automotive chemicals, making it suitable for both engine compartments and heated plumbing applications.

• Compatible media: coolant, water, antifreeze, and similar fluids
• EPDM construction for ozone and heat resistance
• Suitable for heater cores, radiator connections, and overflow lines

How easy is installation and maintenance?

The straight hose design and standard dimensions make installation straightforward with conventional hose clamps and fittings. Cut-to-length flexibility reduces waste and lets you create custom runs; periodic inspection and proper clamp torque ensure long service life.

• Cut-to-fit 15ft length for single or multiple runs
• Works with standard worm-gear or spring clamps
• Routine inspection recommended for clamp tightness and wear

Who is this product for: This EVIL ENERGY 3/4" heater hose is aimed at mechanics, restoration specialists, fleet maintenance teams, and DIY enthusiasts who need a robust, standards-compliant coolant hose. Choose it when you want a long, flexible EPDM hose that meets SAE 20R3 expectations for temperature, pressure, and chemical compatibility, and that can be trimmed and routed to fit a wide range of vehicles and heating applications.