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Pressure Washers · Troubleshooting

Pressure Washer Leaking at the Hose Connection: 5 Causes and Fixes

If water is leaking or spraying from where the high-pressure hose connects to your pressure washer or spray gun, it's almost always an O-ring, fitting, or thread issue that's simple to fix.

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How to fix it

Work through these in order, the most common causes come first.

  1. Start With the Basics

    O-ring condition: Disconnect the hose and look for the small rubber O-ring inside the fitting. Cracked, flattened, or missing O-rings are the most common cause of a leak here by a wide margin. Full seating: Reconnect the fitting and make sure it's fully threaded or clicked into place, not just resting close to seated.

  2. Diagnosing Your Specific Problem

    Leak appears as soon as water is turned on, before the trigger is pulled: almost always a worn or missing O-ring, or an incompletely seated connection. Leak only appears when the trigger is squeezed and pressure builds: less likely to be the hose connection itself, check the spray gun's internal seals or the pump's unloader valve if the O-ring and seating checks don't resolve it. Leak seems to move slightly or comes from just past the fitting, not the fitting itself: inspect the first few inches of hose for a crack or split rather than assuming it's the connection.

  3. See Also

    Pressure Washer Losing Pressure Pressure Washer Not Starting

Start With the Basics

O-ring condition: Disconnect the hose and look for the small rubber O-ring inside the fitting.

Cracked, flattened, or missing O-rings are the most common cause of a leak here by a wide margin.

Full seating: Reconnect the fitting and make sure it's fully threaded or clicked into place, not just resting close to seated.

Which end is leaking: Identify whether the leak is at the pump-side connection or the spray-gun-side connection, since they're independent points that can each need their own fix.

Diagnosing Your Specific Problem

Leak appears as soon as water is turned on, before the trigger is pulled: almost always a worn or missing O-ring, or an incompletely seated connection.

Leak only appears when the trigger is squeezed and pressure builds: less likely to be the hose connection itself, check the spray gun's internal seals or the pump's unloader valve if the O-ring and seating checks don't resolve it.

Leak seems to move slightly or comes from just past the fitting, not the fitting itself: inspect the first few inches of hose for a crack or split rather than assuming it's the connection.

Leak persists after replacing the O-ring: check the fitting threads or quick-connect mechanism for physical damage, like cross-threading or a bent tab, which prevents a proper seal even with a new O-ring.

See Also

Pressure Washer Losing Pressure Pressure Washer Not Starting

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Answers

Frequently asked questions

Why is my pressure washer leaking where the hose connects to the machine?

The most common cause is a worn, missing, or improperly seated O-ring inside the connection fitting. These small rubber rings create the seal between the hose and the pump outlet or spray gun, and they degrade over time or can pop out unnoticed when disconnecting the hose.

Is a small leak at the hose connection dangerous, or just annoying?

It's generally not dangerous, but it does reduce your output pressure since water is escaping before it reaches the nozzle, and consistent leaking accelerates wear on the fitting threads over time. It's worth fixing promptly rather than working around it, both for performance and to avoid a bigger repair later.

Can I replace a worn O-ring myself?

O-rings are inexpensive, widely available either as generic universal kits or brand-specific replacement parts, and swapping one typically takes a couple minutes with no special tools beyond possibly a small pick to remove the old ring. This is one of the most common and easiest pressure washer repairs to do yourself.

Why does my pressure washer leak only when the trigger is squeezed?

This points less toward the hose connection itself and more toward the spray gun's internal seals or the pump's unloader valve, since the leak appears under active pressure rather than at rest. If tightening the hose connection and replacing its O-ring doesn't resolve a leak that only appears while spraying, the spray gun or unloader valve is the next place to check.

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