We have combined our best selling rolling water tank with our AquaSpray Superlite water fed poles to create a completely mobile window or solar panel cleaning system. The 5.2 gallon water tank features a rechargeable 12v battery and a variable water flow button allows the user to control the flow of water to from 29 psi to 70 psi, allowing complete control. The tank also has a wide neck for easy filling and a two stage filter to keep debris and dirt out, and has a 150 feet hose, allowing you reach those difficult to get to places. The AquaSpray Superlite series of water fed poles come in three sizes 20, 24 and 30 feet and are made of lightweight aerospace grade aluminum. Easily connect the water fed pole using the supplied brass male and female quick connectors. NOTE: Commonly used in combination Purified "Pure" Water (De-ionized or Reverse Osmosis) In The Box Aquaspray Pro 20 unit 12 volt 9Ah maintenance free rechargeable battery Battery charger pack 150 feet of water hose Hose Reel Model: Aquaspray Pro20 Water Tank Capacity: 5.2 US Gallons Working Pressure: Variable 29 - 100 psi Flowrate: 0.95 US gallons per minute Dimensions: 16.3" x 16.3" x 42" Weight (including battery): 13 LBS