EVIL ENERGY 5/16" Heater Hose 10 ft — EPDM Coolant Line, SAE 20R3, 100 PSI Working

The EVIL ENERGY 5/16" heater hose is a 10-foot EPDM coolant hose engineered to carry coolant, water, and antifreeze reliably at up to 100 psi across a wide temperature range.

This hose is built for vehicle heating and cooling connections where a compact, flexible, and durable line is needed. It follows SAE 20R3 design standards and offers material and pressure ratings suited to heater cores, radiator overflow lines, and other low-pressure cooling system routes. The combination of EPDM rubber construction and tested performance figures makes it a practical replacement or upgrade for many automotive and small-engine applications.

How strong and temperature-resistant is this EVIL ENERGY heater hose?

The hose is rated for normal duty cooling-system work with a working pressure of 100 psi and a burst resistance up to 300 psi. EPDM rubber gives it broad thermal tolerance so the hose remains pliable in cold and stable under heat.

• Working pressure: 100 psi
• Burst pressure: 300 psi
• Temperature range: -40°F to 257°F
• Meets SAE 20R3 (Standard Wall Class D-2) performance expectations

What are the exact dimensions and handling details I should expect?

The nominal inside diameter is 5/16" (approximately 8 mm) with manufacturing tolerances to ensure reliable fittings and clamps. Outer diameter and minimum bend radius are specified so installers can plan routing without stressing the hose at connection points.

• Internal diameter: 5/16" (8 mm) ±0.4 mm
• Outer diameter: 0.55" (14 mm) ±0.5 mm
• Length: 10 feet (3.05 meters)
• Minimum bending radius: 64 mm to prevent kinks

Which fluids and applications are appropriate for this coolant hose?

Designed for fluid transfer in heating and cooling systems, the EPDM construction resists degradation from common coolant mixtures and water. It suits heater core lines, radiator return or overflow plumbing, and similar low-pressure coolant pathways in cars, trucks, and small equipment.

• Compatible with water, coolant, antifreeze, and similar engine fluids
• Common uses: heater lines, radiator-to-reservoir connections, overflow plumbing
• Not intended for high-pressure fuel or hydraulic lines

Who is this hose for? EVIL ENERGY's 5/16" heater hose is aimed at DIY mechanics, fleet maintenance teams, restoration projects, and anyone needing a dependable replacement or spare for small-diameter coolant plumbing. Its mix of standardized sizing, wide temperature tolerance, and automotive-grade EPDM makes it a sensible choice for heater cores, radiator overflow lines, and other low-pressure cooling routes where space and flexibility matter.