Perfect Compatibility - The foam gun works great for Karcher K2/K3/K4/K5/K6/K7 pressure washers. Auto Foam - Mix car wash and water, shake the foam bottle, and it will produce soft and fluffy snow foam, and spray it on the area you need to clean. Turn the top knob to adjust the foam concentration. Adjustable Nozzle - You can adjust the spray pattern from straight to fan based on demand. Each accessory foam gun is equipped with a rust-proof adjustable foam nozzle and a strong and durable connector to control the pressure of the foam gun. Large Capacity - With a capacity of 750ML, the car wash snow foam gun is enough for 3-4 cars, trucks, SUVs, etc. And the transparent detergent container makes it easy to control the rest of the foam. Wide Application - The foam soap dispenser can be used to clean vehicles, porches, motorcycles, bicycles, patios , shutters, driveways, walls and caravans. Product Description for Karcher K2 K3 K4 K5 K6 K7 Adjustable Nozzle Adjustable Foam Concentration DrRobor Foam Cannon for Karcher Specification: Compatible Models - for Krcher K2 Pressure Washer K3 K4 K5 K6 K7 Bottle capacity - 750ML How to use: 1. Fill the bottle with water (for best results, use lukewarm water, 20% detergent + 80% water). 2. Shake the liquid bottle to mix the shampoo with water. 3. Connect the fluid bottle to the foam lance unit.