The pressure gun – also called a spray gun or trigger gun – is the component you hold when pressure washing, and it is the control point for everything that happens at the end of the hose. Pressure gun attachments connect to the high-pressure hose and allow you to start, stop, and direct the spray. It may seem like a simple handle with a trigger, but a quality pressure gun affects safety, control, and comfort. Understanding the different types, features, and maintenance helps you choose the right gun and use it safely.
Not all pressure guns are compatible with all washers. They must match the pressure rating (psi), flow rating (gpm), and connector type of your machine. Using an under-rated gun is dangerous, and using an incompatible connector causes leaks. This guide explains what to look for in a pressure gun and how to use and maintain it safely.
What a Pressure Gun Does
- Controls flow. Pull the trigger to start spraying; release to stop.
- Provides control. Lets you aim and direct the spray precisely.
- Holds nozzles and wands. Connects to the lance/wand and to nozzles via quick connect or threaded fittings.
- Includes safety features. Many guns have a trigger lock to prevent accidental spraying.
- Handles pressure. Contains high pressure and must be rated for the machine’s output.
When you release the trigger, water either stops or diverts through the unloader/bypass depending on the system. The gun itself is the manual control point.
Types of Pressure Guns
| Type | Description | Best For |
|---|---|---|
| Standard trigger gun | Basic gun with trigger and safety lock | Most consumer/prosumer machines |
| Short gun | Compact, lighter | Detail work, tight spaces |
| Long gun | Longer handle for better leverage | High-pressure work, reduces fatigue |
| Pro/industrial gun | Heavy-duty, higher ratings, often insulated | Commercial, frequent use |
| Telescoping/extension gun | Integrated reach for high areas | Cleaning eaves and high surfaces |
Key Features to Consider
- Pressure rating. Must match or exceed your washer’s psi. Never use an under-rated gun.
- Flow rating. Must handle your washer’s gpm without restriction.
- Connector type. Must match your hose – M22 is common, others exist. Check compatibility.
- Trigger lock/safety. Prevents accidental discharge, especially important for storage and transport.
- Build material. Brass or heavy-duty plastic bodies last longer than cheap plastic.
- Swivel connector. Some guns have a swivel at the hose connection to reduce hose twisting.
- Comfort grip. Rubberized or ergonomic grips reduce hand fatigue.
Compatibility
| Connection | Common Use | Notes |
|---|---|---|
| M22 | Hose to gun (consumer) | Check M22-14 vs M22-15 variant |
| 1/4″ NPT | Threaded connections | Needs correct threading and seal |
| Quick connect | Gun to wand/nozzle | Standard 1/4″ quick connect common |
Confirm both ends – hose connection and wand/nozzle connection – match your setup. Adapters are available but adding them creates potential leak points.
Safe Use of a Pressure Gun
- Inspect before use. Check for cracks, leaks, worn O-rings, and a working trigger lock.
- Point in a safe direction. Never point the gun at people, pets, or yourself.
- Engage safety lock. When not spraying, lock the trigger to prevent accidental discharge.
- Start with low pressure/nozzle. Test on an inconspicuous area first.
- Maintain firm grip. Be prepared for kickback – especially with narrow nozzles or long wands.
- Never leave running unattended. Turn off the machine when not actively spraying.
- Release trigger before changing settings. Follow safe procedures when changing nozzles.
- Avoid spraying electrical sources. Keep clear of outlets, panels, and power lines.
Maintenance
- Inspect O-rings. Replace cracked or flattened O-rings in connections.
- Clean connectors. Remove dirt and grit that prevent sealing.
- Lubricate O-rings. A small amount of silicone grease extends O-ring life.
- Check for leaks. Tighten or replace fittings if leaking.
- Store properly. Hang or store in a clean, dry place with trigger locked.
- Replace damaged guns. Cracks, excessive wear, or a sticking trigger mean replacement is safer.
Frequently Asked Questions
What is a pressure gun?
The handheld trigger gun that controls water flow from a pressure washer. Pulling the trigger releases pressurized water; releasing it stops flow. It connects the hose to the wand and nozzles.
Are all pressure guns interchangeable?
No. They must match the pressure rating, flow rating, and connector type of your machine. Mismatched guns can leak or be unsafe under pressure.
What pressure rating do I need?
Your gun must be rated for at least your machine’s maximum pressure (psi). Using an under-rated gun is dangerous. Higher-rated guns are fine if compatible.
How do I fix a leaking pressure gun?
Usually a worn O-ring at the hose connection or wand connection. Replace the O-ring with the correct size and lightly lubricate with silicone grease. Check for cross-threading or damaged threads.
Can I replace just the pressure gun?
Yes, as long as the replacement matches your machine’s psi, gpm, and connector types. Many guns come with adapters, but fewer adapters mean fewer leak points.
Why does my pressure gun leak when the trigger is released?
This can be normal bypass leakage depending on the unloader, or it can indicate a worn valve seat or O-ring inside the gun. If it leaks excessively, inspect and service or replace the gun.
The Bottom Line
The pressure gun is your main control and safety point. Choose one rated for your machine’s pressure and flow, with the correct connectors, and a working safety lock. A quality gun with a comfortable grip makes long jobs easier and safer. Inspect O-rings regularly, replace damaged guns immediately, and always treat it as a high-pressure tool – point safely, lock the trigger when idle, and never aim at people or animals. The right pressure gun improves control, comfort, and safety for every job.