Quick Answer
If your pressure washer is leaking at the gun and hose connection, the most common cause is an incorrect or loose connection between the hose and spray gun.
Check that the hose is fully inserted and locked in place (push-fit systems), or that the screw collar is tightened correctly (threaded systems). If the connection is secure but the leak continues, the issue is usually a missing or damaged o-ring.
Before You Start
Before inspecting the connection, make sure:
- The pressure washer is switched off
- The trigger is released to remove pressure
- The hose is not kinked or twisted
Always:
- Work in a dry, stable area
- Avoid forcing connections together under pressure
- Check fittings carefully for wear or damage
Important: Never attempt to disconnect or reconnect the hose while the system is pressurised.
How to Fix a Leaking Gun/Hose Connection
Follow these steps to identify and resolve the issue.
1. Check the connection type
Push-fit connection:
- Push the hose firmly into the spray gun
- Twist until you hear or feel it lock into place
- Pull gently to confirm it is secure
Screw-fit connection:
- Check the screw collar is not cracked or cross-threaded
- Tighten securely by hand
- Ensure it is not over-tightened, as this can damage the seal
2. Inspect the o-ring
If the connection is still leaking:
- Check the end of the hose for a small rubber o-ring
- It may be red or black depending on model
- Ensure it is seated correctly and not cracked or missing
If the o-ring is missing or damaged:
- A replacement may be required
We can usually supply replacement o-rings free of charge if the machine is within warranty. Outside warranty, replacements can be purchased via our website.
3. Check for damage to the hose or connector
Look for:
- Cracks in the hose fitting
- Split or worn threads
- Loose or distorted connector ends
If damage is found, the hose or fitting may need replacing.
If the Leak Continues
If the o-ring is present and the connection is secure but water is still leaking:
- The spray gun may be worn internally
- The seal inside the gun may have failed
In this case, a replacement spray gun is usually required. This can be supplied under warranty if applicable, or purchased if the machine is out of warranty.
Important Maintenance Tips
- Always connect hose fittings before turning the machine on
- Regularly inspect o-rings for wear or flattening
- Lightly lubricate o-rings with silicone grease if recommended by the manufacturer
- Avoid forcing connections, as this can damage seals
Frequently Asked Questions
Why is my pressure washer leaking at the gun connection?
The most common causes are a loose hose connection, a missing o-ring, or a worn seal inside the spray gun.
What does the o-ring do?
The o-ring creates a watertight seal between the hose and spray gun. If it is missing or damaged, leaks will occur.
Can I still use my pressure washer if it is leaking?
It is not recommended, as continued use can reduce pressure and potentially damage internal components.
Are replacement o-rings covered under warranty?
Yes, if your machine is within the warranty period, replacement o-rings are typically supplied free of charge.
When do I need a new spray gun?
If the connection is secure and the o-ring is present but leaking continues, the internal seal in the spray gun is likely faulty and the gun should be replaced.
