Question about Kärcher Db 145

The DB 145 nozzle is designed for Kärcher class K 4 and K 5 high-pressure cleaners. To ensure that it fits with your Kärcher 203 Plus, you should check whether your model belongs to these classes or whether it has a compatible connection. The nozzle uses a bayonet connection, which is common on many Kärcher models. If your model has a different connection, an adapter may be required.

I have seen in the specifications that the nozzle is for classes 4 & 5. I assume that the "203 plus" model, which is already a few years old, is class 2.