Karcher Compatibility: Connects directly to the trigger gun of Karcher K 2, K 3, K 4, & K 5 electric pressure washer models. Not compatible with K1700-K2000 models or other brands | 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 | Genuine Karcher Accessory