Pressure Washer Hose Sizes Explained
Choosing the correct replacement pressure washer hose isn't just about finding one that fits your machine. Hose length, internal diameter, pressure rating and connection type all affect how your pressure washer performs.
Many people assume all pressure washer hoses are the same, but using the wrong hose can lead to poor performance, leaks or compatibility problems.
In this guide, we'll explain the different pressure washer hose sizes, what they mean and how to choose the right replacement for your machine.
Why Does Hose Size Matter?
The hose carries high-pressure water from the pressure washer to the trigger gun.
Choosing the correct size helps ensure:
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Maximum cleaning performance
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Safe operation
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Correct water flow
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Proper pressure
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Easy handling
Using the wrong hose may reduce performance or prevent it fitting correctly.
Hose Lengths
Replacement pressure washer hoses are available in a variety of lengths.
Common sizes include:
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4 metres
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5 metres
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6 metres
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8 metres
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10 metres
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12 metres
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15 metres
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20 metres
The best length depends on how you use your pressure washer.
Which Hose Length Should You Choose?
4–6 Metres
Ideal for:
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Small patios
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Cars
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Motorbikes
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Garden furniture
Advantages:
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Lightweight
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Easy to store
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Easy to handle
8–10 Metres
Suitable for:
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Medium-sized driveways
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Decking
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Larger vehicles
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General household use
This is the most popular hose length for domestic pressure washers.
12–20 Metres
Best for:
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Large patios
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Long driveways
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Commercial cleaning
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Agricultural use
Longer hoses reduce the need to move the pressure washer around while cleaning.
Internal Hose Diameter
Pressure washer hoses are manufactured with different internal diameters.
The diameter affects:
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Water flow
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Pressure
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Compatibility
Always use the diameter recommended for your pressure washer.
Using an incorrect diameter may reduce cleaning performance.
Pressure Rating
Every hose has a maximum working pressure.
Before purchasing, check:
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Maximum operating pressure
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Maximum water temperature
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Manufacturer's specification
A replacement hose should always meet or exceed your machine's pressure rating.
Never fit a hose designed for lower pressures.
Connection Types
Pressure washer hoses use several different connection systems.
Common fittings include:
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Quick-release connectors
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Bayonet fittings
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Threaded connectors
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Push-fit fittings
Both ends of the hose must be compatible with your pressure washer and trigger gun.
Can You Fit a Longer Hose?
In many cases, yes.
A longer hose gives greater reach but there are a few things to consider.
Advantages
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Fewer interruptions
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Easier cleaning around vehicles
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Better access to larger areas
Possible disadvantages
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Heavier to move
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More difficult to store
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Slight pressure reduction on some machines when using very long hoses
For most domestic pressure washers, a modest increase in hose length is not a problem when using a suitable replacement hose.
Should You Use an Extension Hose?
Extension hoses are ideal if you occasionally need additional reach.
They are particularly useful for:
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Cleaning caravans
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Washing motorhomes
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Large patios
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Commercial work
Always ensure extension hoses are compatible with your pressure washer.
Are Pressure Washer Hoses Universal?
No.
Even hoses that appear identical may use different:
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Fittings
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Pressure ratings
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Internal diameters
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Connector systems
Always check compatibility before ordering.
How to Measure Your Existing Hose
If you're unsure which replacement to buy:
Measure:
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Overall hose length
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Connection type at each end
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Internal diameter (if known)
Also make a note of your pressure washer's manufacturer and model number.
This helps ensure you purchase the correct replacement.
When Should You Replace a Hose?
Replace your hose if you notice:
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Water leaks
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Cracks
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Bulges
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Damaged fittings
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Kinks restricting water flow
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Pressure loss
A damaged high-pressure hose should never be repaired with tape or sealant.
Common Mistakes to Avoid
Buying Based on Length Alone
A hose may be the correct length but use completely different connectors.
Always check compatibility.
Ignoring Pressure Ratings
The hose should always be suitable for your machine's maximum operating pressure.
Choosing an Extra-Long Hose Without Checking Compatibility
Very long hoses may not be suitable for every pressure washer.
Check the manufacturer's recommendations before upgrading.
Forgetting About Trigger Gun Connections
Many replacement hoses fit the pressure washer itself but not the trigger gun.
Always check both ends.
Looking After Your Pressure Washer Hose
To maximise hose life:
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Store it loosely coiled.
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Avoid tight bends.
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Drain water before winter.
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Keep connectors clean.
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Protect it from prolonged sunlight.
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Inspect it regularly for damage.
Good maintenance helps prevent leaks and extends hose life.
How This Relates to Other Pressure Washer Problems
Choosing the wrong hose or using a damaged hose can contribute to several common faults.
For example:
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If your pressure washer is leaking water, see Pressure Washer Leaking Water? Causes and Fixes
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If pressure is low, read Pressure Washer Has Low Pressure? Causes and Fixes
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If the machine won't build pressure, see Pressure Washer Won't Build Pressure? Causes and Fixes
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If pressure is pulsing, see Pressure Washer Pulsing or Surging? Causes and Fixes
Choosing the Correct Replacement Hose
Before ordering, check:
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Manufacturer
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Model number
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Hose length
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Pressure rating
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Connection type
Using the correct replacement hose helps maintain safe operation and reliable cleaning performance.
You can find replacement pressure washer hoses, extension hoses and accessories for many popular brands, including Kärcher, Nilfisk, Bosch, Makita and more, from Yourspares.
Final Thoughts
Selecting the correct pressure washer hose is about more than simply choosing the right length.
By checking compatibility, pressure rating, connector type and hose size before ordering, you can ensure your pressure washer continues to perform safely and efficiently for years to come.
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