Karcher Variable Nozzle Spray Attachment Accessory for Gas Power Pressure Washers, 4000 PSI Rating The Karcher Promise: Cleaner. Quicker. Quickly adjust the spray pattern of your pressure washer Perfect complement to the Karcher VersaGRIP Spray Gun Fits 1/4" threaded spray wands Fits most gas pressure washers up to 4000 PSI rating