EVIL ENERGY 3/4" Heater Hose 10 ft EPDM Coolant Line SAE 20R3 100 PSI — High-Temp, Flexible

EVIL ENERGY 3/4" Heater Hose is a 10-foot EPDM coolant line built to SAE 20R3 standards for reliable engine and heater-circuit connections at up to 100 psi.

Designed for automotive cooling systems and hot-water heater runs, this 3/4" (19mm) ID hose offers durable EPDM construction, broad temperature tolerance, and clear dimensional specs that make it an easy replacement or upgrade. The hose balances flexibility and pressure performance so it can be used for radiator-to-overflow, heater core, and general coolant routing where SAE 20R3 compatibility is required.

How does this hose stand up to engine bay heat and pressure?

The EPDM compound and reinforced wall meet SAE 20R3 Class D-2 expectations, giving you a stable operating window from -40°F to 257°F. Rated for 100 psi working pressure and a 300 psi burst pressure, it handles typical cooling system loads with a generous safety margin.

• Working pressure: 100 psi; burst pressure: 300 psi
• Temperature range: -40°F to 257°F for thermal resilience
• Constructed from EPDM rubber for heat and ozone resistance

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

This hose has a stated inner diameter (ID) of 3/4" (19mm) with ±0.6mm tolerance and an outer diameter (OD) of 1.10" (28mm) with ±0.8mm tolerance, so measure mating fittings and clamps before installation. The provided 10-foot length gives flexibility to cut to exact runs for heater cores, radiator feeders, or overflow connections.

• Inner diameter: 3/4" (19mm) ±0.6mm
• Outer diameter: 1.10" (28mm) ±0.8mm
• Length: 10 feet — cut-to-length convenience

Which fluids and applications are appropriate for this hose?

The hose is formulated for coolant circuits and compatible with water, antifreeze, and similar heat-transfer fluids; it is not intended for direct fuel or oil service. Typical uses include hot water heater lines, heater core connections, radiator-to-reservoir routing, and other low-to-moderate pressure coolant paths.

• Compatible media: coolant, water, antifreeze
• Common uses: heater cores, radiator-to-overflow, hot water heater piping
• Not recommended for gasoline, diesel, or heavy oil service

How flexible and easy is it to route during installation?

With a minimum bending radius of 152mm, the hose is flexible enough for typical engine bay routing yet stiff enough to resist collapse under vacuum and pressure cycles. The EPDM material stays pliable across its temperature range, simplifying clamp placement and final trimming.

• Min bending radius: 152mm for predictable routing
• EPDM maintains pliability from -40°F to 257°F
• Suitable for clamps, crimp rings, and standard hose fittings

Who is this for: EVIL ENERGY's 3/4" Heater Hose is aimed at auto DIYers, professional technicians, fleet maintenance shops, and anyone replacing or upgrading coolant and heater lines. If you need a recognized SAE 20R3-compatible EPDM hose in a convenient 10-foot length for heater cores, radiator-to-overflow plumbing, or general coolant runs, this hose is engineered for reliable everyday performance without overcomplicated installation steps.