The Kärcher quick-change system fits all Kärcher Professional high-pressure cleaners with the designations HD and HDS, and is screwed directly onto the high-pressure gun. The counterpart (plug nipple) is screwed into the respective accessories.
Please note the accessories changeover in 2017:
Based on the year of the device, you can select the right nozzle.
You can find the year of manufacture of your high-pressure cleaner on the rating plate on the device:
Another selection criterion is the color of the accessories:
black accessories = until year of construction 2016
grey accessories = from year of construction 2017