The only reason I gave this four stars is because this has 3 nozzles instead of 2, so in all fairness to Vevor (and their manfacturer, if different), you MUST use a 4000 PSI, 4 GPM pressure washer to provide sufficient water output to effectively clean the concrete driveway, but this requirement IS noted in their product description. I did have a 3600 PSI, 2.5 GPM Dewalt pressure washer which tripled the amount of cleaning time needed for a relatively easy job (50 ft driveway and 90 ft long sidewalks) as I have had seven hip back, sciatic and knee replacement surgeries. Vevor should give customer the option to buy EITHER a two or three nozzle system when ordering the 18" and higher cleaner because once you get into the 4000 PSI level and above, pressure washers are somewhat cost prohibitive for the average person as they generally start at $1,000 and go up from there. I purchased a Simpson 4200 PSI, 4 GPM system ($1,299) for the best manufactured system with a limited 3 yr/5 yr/10 yr warranty, and this 24" cleaner works like a beast with the right PSI pressure washer!!!
chops 
