Rubber Radiator Hose

-30°C to +120°C SAEJ20R3 Glycol Rated

RPH005-ASH#1

£2.54

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Address

Silicone Hose UK

HolmeBank Business Park, Station Road
Unit 5
Mirfield WF14 8NA
United Kingdom

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Opening hours

Monday	07:00 – 19:00
Tuesday	07:00 – 19:00
Wednesday	07:00 – 18:00
Thursday	07:00 – 18:00
Friday	07:00 – 17:00
Saturday	07:00 – 13:00
Sunday	Closed

Bank holidays may affect our opening hours and delivery times.

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Rubber Radiator Hose is a durable, flexible hose designed for coolant transfer in automotive, marine, agricultural, and industrial engines. Manufactured from high-quality rubber, it offers excellent resistance to heat, pressure, and vibration, ensuring reliable performance in demanding environments. With a smooth internal bore for efficient coolant flow and a reinforced wall for strength, the hose provides long service life and dependable sealing when secured with standard hose clamps. Available in a range of diameters and supplied in various lengths, rubber radiator hose is suitable for both OEM replacement and custom cooling system installations.

Key Features:

Material: High-grade rubber resistant to coolant, heat, and ageing.
Construction: Flexible rubber wall with smooth bore for efficient coolant circulation.
Internal Diameter Range: Available in a wide range of bore sizes.
Operating Temperature: Typically -30°C to +120°C continuous service.
Working Pressure: Up to 10 bar depending on bore size.
Burst Pressure: Minimum 3x working pressure.
Lengths Supplied: Available in standard straight lengths or coil format depending on diameter.
Applications: Suitable for coolant, water, and air transfer.

The hose’s reinforced rubber composition prevents cracking, swelling, and premature wear, even under prolonged heat exposure and high-vibration conditions. Its smooth internal bore reduces flow restriction, ensuring efficient coolant circulation and stable system performance. Designed to withstand pressure cycling and environmental stresses, rubber radiator hose provides a cost-effective and robust solution for cooling system pipework. Simple to install with clamps, it integrates easily into OEM and custom engine layouts.

Applications include use in automotive radiators, intercooler and turbo coolant circuits, marine cooling systems, agricultural engines, and industrial machinery requiring reliable coolant transfer. Rubber radiator hose is widely used for maintenance replacements, preventative upgrades, and custom fabrication projects where durability and heat resistance are essential.

Specifications

Type: Radiator Hose
Colour: Black
Standard: SAEJ20

Size Guide

Inside Diametermm	Outside Diametermm	Wall Thicknessmm	Working Pressurebar	Bursting Pressurebar	Bending Radiusmm	Coil Weightkg	Coil Lengthm
28	38	5	10	30	228	15.5	20
30	40	5	10	30	240	16.5	20
32	42	5	8	24	252	17.4	20
35	45	5	8	24	270	18.8	20
38	48	5	7	21	288	20.3	20
40	50	5	7	21	300	21.2	20
45	55	5	7	21	330	23.5	20
48	58	5	7	21	348	25	20
51	61	5	7	21	366	26.4	20
60	70	5	7	21	420	1.8	1
70	82	6	7	21	492	2.3	1
76	88	6	7	21	528	2.55	1
90	102	6	7	21	612	3.2	1
102	114	6	7	21	684	3.59	1

Measurements are nominal and may vary slightly.

How to measure ID

1

Measure the pipe, not the old hose

Heat and age make a used hose swell and go out of round. Take your reading across the metal outlet the hose slides onto — that measurement is your ID.

2

Use vernier calipers

Set the outer jaws across the widest point of the pipe. A tape measure round a curve reads low by a millimetre or two — enough to buy the wrong size.

3

Take three readings, keep the largest

Rotate 60° between each. If they disagree the pipe is oval; size to the biggest figure so the hose still seals.

4

Round to the nearest listed bore

Never go up: a bore wider than the fitting will not grip, whatever the hose is made of. If you land between listed sizes take the smaller bore, and secure it with a clip.

Order by ID, always. Every hose on this site is listed by internal diameter. OD is given for clearance only — it changes with wall thickness and ply count, so it is never the ordering size. On reducers, quote both ends, largest first.

Construction

Outer cover

Wrapped synthetic rubber outer

Reinforcement

High tensile fibre yarn

Inner liner

Smooth black EPDM inner

14 bore sizes28mm to 102mm internal diameter

-30°C to +120°Ccontinuous service temperature

30 bar burst10 bar working on the smallest bore

SAE J20 built to standardthe automotive coolant hose standard

Rubber, done right. EPDM throughout.

Coolant-rated rubber for the jobs that do not need silicone money.

INTERNAL DIAMETERS

28mm to 102mm

RATED

−30°C to +120°C

WORKING PRESSURE

Up to 10 bar

BUILT TO

SAE J20

SOLD BY

The metre

Specification at a glance

Across the whole 28mm–102mm range.

28mm –102mm Inside diameter

38mm –114mm Outside diameter

5mm –6mm Wall thickness

228mm –684mm Bending radius

7bar –10bar Working pressure

21bar –30bar Bursting pressure

Inside diameter (mm)	Outside diameter (mm)	Wall thickness (mm)	Working pressure (bar)	Bursting pressure (bar)	Bending radius (mm)	Coil weight (kg)	Coil length (m)
28	38	5	10	30	228	15.5	20
30	40	5	10	30	240	16.5	20
32	42	5	8	24	252	17.4	20
35	45	5	8	24	270	18.8	20
38	48	5	7	21	288	20.3	20
40	50	5	7	21	300	21.2	20
45	55	5	7	21	330	23.5	20
48	58	5	7	21	348	25	20
51	61	5	7	21	366	26.4	20
60	70	5	7	21	420	1.8	1
70	82	6	7	21	492	2.3	1
76	88	6	7	21	528	2.55	1
90	102	6	7	21	612	3.2	1
102	114	6	7	21	684	3.59	1

Show all 14 sizes → Show fewer

How it's built

Three layers, each doing one job.

Three layers, from the outside in: wrapped synthetic rubber outer, high tensile fibre yarn and smooth black EPDM inner. Each one is doing a different job.

1

Outer cover

Wrapped synthetic rubber outer

2

Reinforcement

High tensile fibre yarn

3

Inner liner

Smooth black EPDM inner

Product gallery

Frequently Asked Questions.

Answers to the questions we’re asked most about sizing, fitment and performance.

Still can't find your answer?

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What is it used for?

Coolant transfer in automotive, marine, agricultural and industrial engines - a smooth internal bore for efficient flow with a reinforced wall.

What size and length do I order?

Order by internal diameter, matched to the outside diameter of the pipe stub or spigot it slides over. Measure the pipe with vernier callipers rather than the old hose, which stretches in service and reads large. Available in internal diameters from 5mm to 102mm, lengths from 1 Metre to 20 Metres (Full Coil). Full coils work out considerably better value per metre than cut lengths.

What standard is it built to?

It is manufactured to SAE J20. Buying to a recognised standard matters here - it means the construction, pressure rating and performance have been benchmarked rather than simply described.

Can I use it for fuel or oil?

No - EPDM and general-purpose rubber have poor resistance to hydrocarbons and will soften, swell and eventually fail. For fuel and oil use our SAE J30 R6 rubber hose or a fluorosilicone-lined silicone hose.

How do I know when it needs replacing?

Squeeze it. Hard and brittle, or spongy and swollen, both mean it is done. Look for surface cracking when you flex it and crusty residue or staining round the clips, which indicates seepage. Replace on condition rather than waiting for a failure.

How should it be secured?

Proper hose clips, one at each end, positioned squarely over the barb or spigot. Support long runs with rubber-lined P-clips so the hose cannot chafe against a bracket, panel or wiring loom, and keep it clear of exhaust components.