VEVOR 18" Pressure Washer Surface Cleaner, Stainless Steel Pressure Washer Attachments with 4 Wheels, 4000 Max PSI, 3/8 Quick Connector, 2 Spray Nozzles, Dual Handle, for Concrete, Patio, Sidewalk

This product is suitable for pressure washer up to 275 bar.

The version with handles can be directly connected to the hose of the high pressure washer via a 3/8 quick-connect thread.

12–15 L/min (about 3.2–4 GPM) is the minimum efficient range for that 18" surface cleaner. Below ~10 L/min: works poorly / slow / streaky 12–15 L/min: good, efficient cleaning 15+ L/min: fast, professional-level results