Streamline your window and solar cleaning process with the AquaSpray 4.2 Gallon Water Tank Backpack and watch your productivity increase! With the ability to provide your own, particulate free water source… you won’t be trapped by how far the hose can reach or be worried about streaks.It’s not news to anyone that municipal water supplies carry a host of particulates that can result in sloppy cleaning jobs and leave smears on those high dollar windows and solar panel units.The solution? Supply your own high-quality water to eliminate the problem altogether.The battery-powered pump in the backpack allows for a variable water pressure of 29 - 72 psi and flow rates of up to a Gallon Per Minute.Completely portable, this backpack water tank weighs just 13 pounds.Being completely self-sufficient opens up the scope of jobs you can take on and ultimately will increase productivity, and the overall quality of your work. See for yourself! Model: Aquaspray Backpack Water Tank Capacity: 4.2 US Gallons Working Pressure: Variable (29 - 72 psi) Flowrate: 0.8 Gallons per minute Weight (including battery): 13 LBS