Unloaders
VRT3 Unloader
K7 Unloader
VRT100 Unloader
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How to Choose Pressure Washer Unloader
An unloader is the safety valve between your pump and your gun. When you release the trigger, it diverts water back to the pump or out the bypass so pressure doesn't spike and blow your seals. Pick the wrong one and you'll either starve the system or burn it out. Get it right and your pump lasts years longer.
Match the PSI and GPM to your pump
This is the call that matters most. Your unloader has to be rated above your pump's max output on both pressure and flow. Run a 5 GPM pump through an unloader rated for less and you'll restrict flow and overheat the bypass loop. Use the chart below as your starting point and cross-check against your pump's spec sheet.
Flow-actuated vs. pressure-actuated
Pressure-actuated unloaders (VRT3, VRT100) respond when pressure in the line builds. They're the standard choice and work with almost any setup. Flow-actuated unloaders (K7) respond when water stops moving instead, which gives smoother pressure control with fewer moving parts and no external springs to wear out. Flow-actuated tends to be the better pick if you've had repeat unloader failures on a system that pulses or chatters.
Port sizes and fittings
The VRT3 and K7 both use 3/8" connections. The VRT3 is FPT on both inlet and outlet, while the K7 uses a 3/8" FPT inlet and a 3/8" MPT outlet. Both cover most residential and light-commercial rigs. The VRT100 steps up to 1/2" FPT on inlet, outlet, and bypass for high-flow systems running surface cleaners and twin-lance setups. Don't try to neck a 1/2" pump down to 3/8" fittings just to fit a smaller unloader. That restriction kills performance.
Pressure Washer Unloader Sizing Chart
| Pump rating | Recommended unloader | Type |
|---|---|---|
| Up to 3,500 PSI / 6.6-10 GPM | K7 Unloader | Flow-actuated |
| Up to 4,500 PSI / 10.5 GPM | VRT3 Unloader (EZ Start) | Pressure-actuated |
| Up to 4,640 PSI / 26 GPM | VRT100 Unloader | Pressure-actuated, high-flow |
Note: The K7 is flow-actuated and requires at least 6.6 GPM to operate correctly. For pumps under 6.6 GPM, go with the VRT3.
Related Categories
- Pressure Washer Pumps
- Pressure Washer Guns
- Pressure Washer Hose
- Pump Repair Kits
- All Pressure Washing Equipment
Frequently Asked Questions
What does a pressure washer unloader valve actually do?
The unloader sits on the pump and reroutes water through a bypass loop the moment you let off the trigger. Without it, pressure has nowhere to go when the gun closes. It spikes inside the pump and blows out seals, packings, and check valves. Every triplex pressure washer pump needs one.
What's the difference between a flow-actuated and pressure-actuated unloader?
Pressure-actuated unloaders (VRT3, VRT100) trigger when downstream pressure rises past their setpoint. Flow-actuated unloaders (K7) trigger when water flow stops. Flow-actuated designs tend to have fewer moving parts and give smoother pressure control, which is why pros running high-cycle commercial rigs often prefer them. Pressure-actuated is the more common standard and works fine for most setups.
How do I know which unloader fits my pump?
Match it to your pump's max PSI and GPM. For triplex pressure washer pumps between 6.6 and 10 GPM (most General Pump, Comet, and AR pressure washer triplex models in that range), the K7 or VRT3 will both work. Under 6.6 GPM, go with the VRT3, because the K7 has a minimum flow rating. Anything over 10 GPM (twin-lance setups, big surface cleaners, hot-water rigs, or high-flow soft wash diaphragm pumps like the AR45) needs the VRT100 and its 1/2" ports.
Why is my pressure washer pulsing or surging?
If you've already replaced the seals and check valves and the pressure still hunts, the unloader is the next suspect. Worn unloaders stick partially open, bleed pressure internally, or chatter as they cycle. Test it by capping the bypass and watching whether pressure holds. If it doesn't, replace the unloader.
Can I rebuild an unloader or do I have to replace it?
Some unloaders are rebuildable with O-ring kits, but the cost of a rebuild kit plus the downtime often isn't worth it at this price point. For the VRT3, replacement is almost always the right call. For the VRT100 and K7, inspect the piston and seat. If the brass is scored, replace it; if the seals are just tired, a rebuild can buy you another season.
What's the EZ Start feature on the VRT3?
EZ Start drops system pressure during startup so your engine can crank without fighting the pump. That means less stress on the starter, the recoil, and the pump itself, especially on cold mornings. It's a small feature that makes a big difference if you start and stop your machine multiple times a day.
