The WA4036 Hydroshot soap bottle simply attaches to the front of the Hydroshot lance. When the Hydroshot is in action The water will draw cleaning fluid (to be applied to the bottle) and provide you with a cleaning mixture to wash your surfaces with. This Is a valid addition to your WORX Hydroshot. Compatible with all Hydroshot models.13.5 oz container for your soap mixture. Quick snap connection provides a steady water flow while cleaning. Ideal for adding soap to any cleaning project, including cars, boats, windows, and more. Compatible with all Hydroshot models only. Not compatible with Pressure Washer models.