Rubber Marine Fuel & Oil Hose

ISO7840 Standard A1 Spec Fuel & Oil Safe

RMH005-ASH#1

£3.22

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Silicone Hose UK

HolmeBank Business Park, Station Road
Unit 5
Mirfield WF14 8NA
Vereinigtes Königreich

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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 Marine Hose is a heavy-duty, fuel-resistant hose designed for marine fuel delivery, engine connections, and onboard fuel transfer systems. Manufactured with a smooth black nitrile rubber inner tube, reinforced with high-strength polyester braids (with an additional wire helix for sizes 25 mm and above), and covered with a synthetic nitrile rubber blend, the hose provides excellent durability, fuel compatibility, and resistance to harsh marine environments. Conforming to BS EN ISO 7840 standards, Rubber Marine Hose is fully approved for marine fuel systems, ensuring safe and reliable performance across a wide range of applications. With an extended temperature range from -40°C to +100°C (peaks up to +120°C), the hose maintains flexibility and integrity under extreme operating conditions.

Key Features:

Inner Layer: Black smooth nitrile rubber for oil and fuel resistance.
Reinforcement: High-strength polyester braids; wire helix included in sizes 25 mm ID and above for added strength.
Outer Layer: Black synthetic nitrile blend for weathering, abrasion, and fuel resistance.
Operating Temperature: -40°C to +100°C (peak +120°C).
Working Pressure: 5 bar to 10 bar depending on size.
Burst Pressure: 15 bar to 30 bar (3:1 safety factor).
Internal Diameter Range: 5 mm to 51 mm.
Wall Thickness: 3.5 mm to 6 mm depending on diameter.
Bending Radius: 72 mm to 378 mm depending on size.
Standard: BS EN ISO 7840 compliant for marine fuel use.

The nitrile rubber construction ensures excellent resistance to petrol, diesel, oil, and related hydrocarbons, making it fully suited for marine fuel delivery and transfer. Polyester braid reinforcement provides dimensional stability and pressure strength, while the inclusion of a wire helix in larger diameters enhances suction capability and prevents collapse. Its robust outer cover resists saltwater, UV radiation, abrasion, and general marine wear, extending service life even in harsh conditions. Flexible across a wide temperature range, the hose remains easy to install and secure in confined onboard spaces.

Applications include marine fuel lines, engine feed hoses, deck-to-tank transfer, bilge systems, and general fuel and oil transfer in marine and offshore environments. Rubber Marine Hose is widely adopted across commercial shipping, leisure craft, and offshore platforms where safety, durability, and hydrocarbon resistance are critical requirements.

Specifications

Type: Marine Fuel & Oil Hose
Colour: Black
Standard: ISO7840

Size Guide

Inside Diametermm	Outside Diametermm	Wall Thicknessmm	Working Pressurebar	Bursting Pressurebar	Bending Radiusmm	Coil Weightkg	Coil Lengthm
5	12	3.5	10	30	72	17	100
6	13	3.5	10	30	78	18	100
8	15	3.5	10	30	90	20	100
10	17	3.5	10	30	102	24.5	100
13	21	4	10	30	126	32	100
16	25	4.5	10	30	150	10	50
19	28	4.5	10	30	168	25	50
25	36	5.5	5	15	216	14	20
32	42	5	5	15	252	17	20
38	50	6	5	15	300	20	20
51	63	6	5	15	378	24	20

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

1 · Outer cover

Black synthetic nitrile blend

Weathering, abrasion, and fuel resistance

2 · Reinforcement

High-strength polyester braids; wire helix included in sizes 25 mm ID and above

Added strength · 5 bar to 10 bar depending on size · 15 bar to 30 bar (3:1 safety factor)

3 · Inner liner

Black smooth nitrile rubber

Oil and fuel resistance · -40°C to +100°C (peak +120°C)

Conforms to BS EN ISO 7840 for marine fuel use.

11 bore sizes5mm to 51mm internal diameter

30 bar burst10 bar working on the smallest bore

ISO7840 built to standardthe standard this range is built to

Fuel rated. Properly certified.

Nitrile and fuel-resistant rubber, built to a published standard.

INTERNAL DIAMETERS

5mm to 51mm

RATED

−40°C to +100°C

WORKING PRESSURE

Up to 10 bar

BUILT TO

ISO 7840

SOLD BY

The metre

Specification at a glance

Across the whole 5mm–51mm range.

5mm –51mm Inside diameter

12mm –63mm Outside diameter

3.5mm –6mm Wall thickness

72mm –378mm Bending radius

5bar –10bar Working pressure

15bar –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)
5	12	3.5	10	30	72	17	100
6	13	3.5	10	30	78	18	100
8	15	3.5	10	30	90	20	100
10	17	3.5	10	30	102	24.5	100
13	21	4	10	30	126	32	100
16	25	4.5	10	30	150	10	50
19	28	4.5	10	30	168	25	50
25	36	5.5	5	15	216	14	20
32	42	5	5	15	252	17	20
38	50	6	5	15	300	20	20
51	63	6	5	15	378	24	20

Show all 11 sizes → Show fewer

How it's built

Three layers, each doing one job.

Three layers, from the outside in: black synthetic nitrile blend, high-strength polyester braids; wire helix included in sizes 25 mm ID and above and black smooth nitrile rubber. Each one is doing a different job.

1

Outer cover

Black synthetic nitrile blend

Weathering, abrasion, and fuel resistance

2

Reinforcement

High-strength polyester braids; wire helix included in sizes 25 mm ID and above

Added strength5 bar to 10 bar depending on size15 bar to 30 bar (3:1 safety factor)

3

Inner liner

Black smooth nitrile rubber

Oil and fuel resistance-40°C to +100°C (peak +120°C)

Product gallery

Frequently Asked Questions.

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

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What is it used for?

Marine fuel delivery, engine connections and onboard fuel transfer. It is built to ISO 7840 A1 - the fire-tested, low-permeation grade specified for permanently installed fuel lines on recreational craft.

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 51mm, 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 ISO 7840. Buying to a recognised standard matters here - it means the construction, pressure rating and performance have been benchmarked rather than simply described.

Is it compatible with E5 and E10 petrol?

Yes - the nitrile-based compound is formulated for modern ethanol-blended fuels as well as diesel and oils. Ethanol attacks unsuitable rubber from the inside, so an older line can look perfectly sound externally while breaking down internally and shedding debris into the fuel system.

Can I use automotive fuel hose on a boat instead?

No, and it is worth being blunt. Automotive hose is not fire tested and permeates far more fuel vapour, which on a boat accumulates in an enclosed bilge rather than dispersing. Insurers and surveyors will pick it up, and it is a genuine safety issue.

How should it be secured?

Two stainless clips at every fuel connection, which is what the standard expects below the waterline or in an engine space. Use 316 stainless rather than plated, and support the hose so it cannot chafe against a bulkhead or engine mount.