Karcher Dirtblaster Hose Nozzle for Gas Power Pressure Washers, Rated 4000PSI The Karcher Promise: Cleaner. Quicker. Best-in-class cleaning performance. Karcher DirtBlaster Nozzle for 2600-3600 PSI Gas Pressure Washers Increases the effective cleaning power of a gas pressure washer by up to 50%. Compatible with pressure washers rated 2600 - 4000 PSI. Offers the concentrated cleaning power of a zero degree nozzle with the wider cleaning area of a standard spray nozzle Not for use on delicate surfaces. Always test an inconspicuous area before cleaning with a rotating nozzle.