This adapter fitting has the M22 Standard male thread at one end (the same that connects to the Rockcar flexible green hose), and has the Karcher quick release hose fitting at the other end.

Solid brass with rubber o ring.  High quality.  High pressure connection.  From Rockcar.  

When in doubt please check your machine and the dimensions on the existing hose/fitting.  

Important: Water blaster manufacturers change hose fittings even between the same models as they change hose suppliers.  Please check your fitting matches the guide before ordering.   Karcher is however pretty consistent. 

This is type 1 on this guide.  Note the flat sides: