EPDM Flexible Coolant Hose — Car Heater & Radiator Water Pipe, SAE J20R3

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EPDM Flexible Coolant Hose — Car Heater & Radiator Water Pipe, SAE J20R3

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Size(ID x Outer Diameter): 4mm x 10mm

Length: 1 Meter

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EPDM Flexible Coolant Hose — Reliable Heater & Radiator Water Pipe for Automotive Cooling Systems

A leaking or cracked coolant hose can sideline a vehicle fast — and finding the right replacement in the exact size you need shouldn't be a separate project. Whether you're a DIY mechanic refreshing an aging cooling system, a shop tech building a custom coolant circuit, or a hobbyist routing heater lines in a kit car, this EPDM flexible coolant hose gives you a cut-to-length solution in a wide range of diameters.

Each listing covers a single continuous length of flexible rubber hose constructed from EPDM (ethylene propylene diene monomer) rubber. Available inner diameters range from 4mm (≈5/32") to 25mm (≈1"), with corresponding outer diameters from 10mm (≈3/8") to 34mm (≈1-3/8"). Length options are 1 meter (≈39"), 2 meters (≈79"), 5 meters (≈197"), and 10 meters (≈394"). Select the size and length combination that matches your application from the variant dropdowns above.

Typical use cases include replacing OEM heater hoses on passenger cars and light trucks, routing coolant lines in engine swaps and custom builds, connecting radiator overflow tanks, and plumbing auxiliary heater cores — all applications where a flexible coolant hose rated to SAE J20R3 is the appropriate specification.

ℹ️ Compatibility Note: This hose is designed for water/glycol-based coolant circuits (SAE J20R3). It is not suitable for petroleum-based fuels, oils, or brake fluid. Verify your fitting OD matches the hose ID before ordering.

✅ Key Features of These EPDM Flexible Coolant Hoses

🌡️Wide Temperature Tolerance — EPDM rubber generally handles continuous service from -40°F (-40°C) to 257°F (125°C), covering the full operating range of most automotive cooling and heater circuits.
🧪Coolant & Antifreeze Resistant — Formulated to resist ethylene glycol antifreeze, water/glycol mixtures, and common OEM coolant additives without swelling or degrading over time.
📐11 Diameter Options, 4 Lengths — Inner diameters from 4mm to 25mm paired with 1m, 2m, 5m, or 10m lengths let you order exactly what your flexible coolant hose replacement or custom build requires.
🏎️SAE J20R3 Rated — Meets the Society of Automotive Engineers J20R3 standard for coolant hose performance, covering heat resistance, pressure resistance, and fluid compatibility benchmarks.
🔄Flexible & Easy to Route — The EPDM construction allows the hose to bend around tight underhood corners without kinking, simplifying installation in confined engine bays and custom routing paths.
☀️Ozone & UV Resistant Exterior — EPDM's inherent resistance to ozone and UV degradation helps the hose maintain its integrity in underhood environments where heat cycling and exposure are constant.

📐 Technical Specifications — EPDM Flexible Coolant Hose

Material	EPDM (Ethylene Propylene Diene Monomer) Rubber
Standard / Rating	SAE J20R3
Inner Diameter (ID) Range	4mm (≈5/32") — 25mm (≈1")
Outer Diameter (OD) Range	10mm (≈3/8") — 34mm (≈1-3/8")
Available Sizes (ID × OD)	4×10mm, 5×11mm, 6×12mm, 8×14mm, 10×16mm, 12×18mm, 14×20mm, 16×23mm, 19×27mm, 22×30mm, 25×34mm
Available Lengths	1m (≈39"), 2m (≈79"), 5m (≈197"), 10m (≈394")
Temperature Range	Typically -40°F to 257°F (-40°C to 125°C)
Fluid Compatibility	Water/glycol coolant, ethylene glycol antifreeze — not for petroleum fuels or oils
Working Pressure	See variant options — contact us to confirm for pressure-critical circuits
Wall Thickness	See variant options (varies by diameter)
Hose Type	Straight, flexible, unbent
Color	Black
Country of Origin	China

⚠️ Before You Order: Measure your existing hose or fitting barb OD carefully. The ID listed is the hose's inner bore — it should match or be very slightly smaller than your fitting OD for a secure, clamp-ready fit.

❓ Frequently Asked Questions

How do I choose the right hose size?

Match the hose inner diameter (ID) to your fitting or pipe OD. For example, a 10mm barb fitting typically requires the 10mm ID hose. If you're between sizes, size down for a snug, leak-free fit. All sizes are listed as ID × Outer Diameter (e.g., 10mm × 16mm). Common inch equivalents: 4mm ≈ 5/32", 6mm ≈ 1/4", 10mm ≈ 3/8", 16mm ≈ 5/8", 19mm ≈ 3/4".

What temperature range can this hose handle?

EPDM rubber generally withstands continuous operating temperatures from approximately -40°F (-40°C) up to 257°F (125°C), making it suitable for most automotive cooling and heating circuits.

Is this hose compatible with antifreeze and coolant additives?

Yes. EPDM is chemically resistant to ethylene glycol-based antifreeze, water/glycol mixtures, and most OEM-approved coolant additives. It is not recommended for petroleum-based fluids or fuel lines.

What does SAE J20R3 mean and why does it matter?

SAE J20R3 is a Society of Automotive Engineers standard for coolant hoses. It specifies minimum requirements for heat resistance, pressure resistance, and compatibility with engine coolants. Choosing a J20R3-rated hose helps ensure the hose meets established automotive performance benchmarks.

Can I use this hose for outdoor or underhood applications?

EPDM has good resistance to UV exposure, ozone, and weathering, making it generally suitable for underhood and outdoor environments. For prolonged direct UV exposure, a protective sleeve or wrap is recommended.

What working pressure can this hose typically handle?

Working pressure varies by wall thickness and diameter. Smaller ID hoses (4–8mm) typically handle higher pressures than larger ID hoses. For exact pressure ratings for your specific size, please contact us to confirm before use in high-pressure circuits.

Can I cut the hose to a custom length?

Yes. The hose is sold in straight lengths (1m, 2m, 5m, or 10m) and can be cut cleanly with a sharp utility knife or hose cutter. Select the length closest to your need to minimize waste.

🛒 Select your size and length above, then add to cart — ships from our US warehouse.

EPDM Flexible Coolant Hose — Car Heater & Radiator Water Pipe, SAE J20R3

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Beschreibung

EPDM Flexible Coolant Hose — Reliable Heater & Radiator Water Pipe for Automotive Cooling Systems

✅ Key Features of These EPDM Flexible Coolant Hoses

📐 Technical Specifications — EPDM Flexible Coolant Hose

❓ Frequently Asked Questions

EPDM Flexible Coolant Hose — Car Heater & Radiator Water Pipe, SAE J20R3

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