"Perfect Compatibility - The foam gun works perfectly 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 concentration foam. 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, durable connector to control foam gun pressure. Large Capacity - With 750ML capacity, the snow foam gun car wash is enough for 3-4 cars, trucks, SUVs, etc. And the clear detergent container makes it easy to control the rest of the suds. Wide Application - The foam soap dispenser can be used to clean vehicles, conservatories, motorbikes, bicycles, patios, shutters, driveways, walls and caravans."