Karcher Compatibility: Connects directly to the trigger gun of Karcher K1-K5 electric pressure washers. NOT compatible with Kärcher K1700-K2300 electric pressure washers or gas pressure washers. NOTE FOR OLDER PRESSURE WASHERS: If you wish to use this spray wand with a Karcher electric pressure washer purchased before 2010, you must also order "Adapter M" (part number 2.643-950.0) The Karcher Promise - Cleaner. Quicker: Turns your Karcher pressure washer into a personal car wash. It can also be used to clean garden furniture, siding, stairways, RV's, paths, walls, patios, driveways, & more Easy to Use: Simply add detergent into the foam cannon, add water, attach the nozzle to your pressure washer gun and apply the foam. Detergent flow and spray level can both be easily adjusted on the FJ6 foam cannon Tank Volume: The FJ6 container holds approximately 20 ounces and lasts longer between refills The Karcher Promise - Cleaner. Quicker: Turns your Karcher pressure washer into a personal car wash. It can also be used to clean garden furniture, siding, stairways, RV's, paths, walls, patios, driveways, & more.