The Karcher Dirtblaster lance can be used with any Karcher pressure washer in the K1-K4 series. This accessory has a rotating pencil jet which blasts rotating water at high pressure thus giving up to 50% greater cleaning power. This accessory is a very high performance cleaning attachment that is ideal for cleaning Patios & Driveways with their stubborn moss covered surfaces. This accessory is to be used with Karcher pressure washers from the K1 to K4 series.