Perfect Compatibility - The foam gun is compatible with Karcher K2, K3, K4, K5, K6, and K7 pressure washers. Auto Foam Function - Mix car wash shampoo and water, shake the bottle, and generate soft snow foam that can be sprayed onto surfaces needing cleaning. Adjust the foam concentration by turning the top knob. Adjustable Nozzle - Customize the spray pattern from a direct stream to a wide fan spray as needed. Each foam gun comes with a rust-resistant adjustable nozzle and a durable connector to maintain optimal pressure control. Large Capacity - The 750ML detergent bottle provides enough foam for cleaning 3 to 4 vehicles, trucks, or SUVs. The transparent container allows easy monitoring of remaining solution. Wide Application - Suitable for cleaning cars, motorcycles, bicycles, patios, porches, driveways, walls, shutters, and caravans. Compatible Models: Karcher K2, K3, K4, K5, K6, K7 Bottle Capacity: 750ML How to Use: 1. Fill the bottle with water (for best results, use lukewarm water with a mixture of 20% detergent and 80% water). 2. Shake the bottle to mix the shampoo and water thoroughly. 3. Attach the bottle to the foam lance unit.