Karcher Pressure Washer Connect 'n' Clean Foam Nozzle 2.643-767.0 The quick-change system for applying detergent allows rapid switching between different detergents with a single click. Detergent Dose can easily be adjusted on the foam nozzle (yellow knob). Can also adjust the jet level as required. Fits all pressure washers from K2-K7 classes. Please Note: Does not include any detergent.