Ideal for cleaning flat surfaces including patios, driveways and paving Can also be used on vertical surfaces such as fences, walls and garage doors Cleans six times faster than a conventional nozzle Suitable for Nilfisk pressure washer Easy installation by snapping into place The item is compatible with all Nilfisk Pressure washers compatible with these series - Compact, Core, Dynamic and Excellent. The product is NOT compatible with the following pressure washers - Pro, Premium In case of problems, check that the nozzles used in the rooterarm are free of debris If the rotor arm does not rotate even after the dirt has been removed, there is likely to be a small amount of debris on the rotating parts that prevents rotation. To do this, loosen all U-cotter pins and screw caps and disassemble all rotating parts of the patio cleaner. Clean all parts thoroughly under running water. To clean the nozzles, use a nozzle cleaning needle or a straightened paper clip to clean the nozzle openings under running water. Then reassemble all the parts