This attachment allows you to control the water flow and pressure of your professional Karcher pressure washer at the trigger gun with a simple turn of the servo control. Suitable for Easy!Lock pressure washers with a flow rate of 750 - 1100 l/h.Compatible with:HD 10/25-4 SHD 7/16-4 STHD 9/18-4 STHD 9/20-4 MHD 9/23HDS 10/20-4 MHDS 1000HDS 7/10-4 MHDS 7/16 CHDS 7/9-4 MHDS-E 8/16-4 M