The MTM Original Foam Cannon 1.1mm Orifice Installed is the best power washer on the market. This is the original foam cannon that I've had for 6 or so years. MTM has a rebuild kit for it but I've never needed it. The new PF-22 is subtly better but this one still gets the job done quite well. I haven't used the knock off but I know this is much better built.
MTM Hydro Original Foam Cannon
Veloci Performance Products - MTM Hydro PF22 Foam Cannon
Hi-Tech Low Pressure Foam Gun - LPFMR
MTM Hydro PF22.2 Foam Cannon 14.7022. Professional Detailing
Car Wash Foam Gun Adjustable Hose Wash Sprayer & Ratio Dial/Snow
Cheap Car Wash Foam Gun Adjustable Car Wash Sprayer 3/8/NPT 3/4
BLACKFIRE Foam Booster, foaming booster shampoo
Car Wash Foam Adjustable Car Wash Sprayer 3/8/NPT 3/4 Connector
Swtroom car wash foam gun make a Great Foam for washing your vehicles or equipment. Just spray and rinse. No more painstaking scrubbing with sponges or mitts or expensive carwashes to get that hand washed shine. Can be connected to Faucet and garden hose. The Foam Gun can be used for car washing, floors or Windows washing, or use it to water flowers and plants. Ideal for enthusiast or professional use. Give your car a complete foam bath to remove dirt and grime.
Swtroom Car Wash Foam Gun, Car Wash Soap Spray with 3/8 Brass Connector, Double Filtration, Grade 6 Foam Concentration (Green)