Milwaukee's M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply kit delivers the industry’s first interchangeable tank design with no manual pumping. Designed to meet your water supply needs for concrete cutting and coring, the battery-powered water supply delivers instant, constant and adjustable pressure up to 60 PSI. The 5-mode pressure regulator adjustment knob adjusts the pressure between 20 – 60 PSI for ultimate control. The M18™ REDLITHIUM™ XC3.0 Battery provides you with up to 12 tanks of water delivery per charge. The 4-gallon water supply tank features a dual diaphragm pump for increased durability and longer pump life. The tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank. The backpack frame includes wide straps and a handle providing you with convenient transportation and storage. The 4-Gallon Water Supply is made up of two components – the M18™ SWITCH TANK™ Powered Base and the SWITCH TANK™ 4-Gallon Water Supply Tank Assembly. The Powered Base includes the motor, battery compartment, and REDLINK™ electronics, while the interchangeable Tank Assembly includes the pump, 10ft hose, and quick-connect. The isolated pump, hose, and quick-connect design allows you to add on tank assemblies for different applications, eliminating cross-chemical contamination. It also provides you with the ability to replace the tank assembly at a lower cost of ownership compared to replacing the entire water supply. The Powered Base is also compatible with the SWITCH TANK™ 4-Gallon Concrete Sprayer (49-16-28CS) and 4-Gallon Sprayer (49-16-28PS) Tank Assemblies. The M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply is part of the M18™ system which is fully compatible with over 175 tools. In addition to the backpack water supply, the kit includes one M18™ REDLITHIUM™ XC3.0 Battery and an M18™/M12™ Multi-Voltage Charger.  Interchangeable Tanks, No Manual Pumping Up to 12 Tanks Per Charge Add-On, Replace and Interchange SWITCH TANK™ Concrete Sprayers and Water Supply Tanks Instant, Constant and Adjustable Pressure for Ultimate Control Up to 60 PSI Run-time: Up to 12 tanks per charge with M18™ REDLITHIUM™ XC3.0 Battery OSHA Table 1 Compliant when Concrete Cutting and Coring Wide Mouth Opening for Easier Pouring Strainer to Filter Debris Wide Straps and and handle for convenient transport and storage Compatible with SWITCH TANK™ Concrete Sprayer and Pesticide Tank Assemblies Weight: 15.9 lbs Dimensions: 9.5" Long x 16.25" High x 13" Wide Includes: (1) M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply Kit (2820-21WS) (1) SWITCH TANK™ 4-Gallon Water Supply Tank Assembly (49-16-28WS) (1) M18™ REDLITHIUM™ XC Extended Capacity Battery (48-11-1828) (1) M18™ & M12™ Multi-Voltage Charger (48-59-1812) (1) 10ft Hose w/ Quick-Connect (1) Water Spray Nozzle w/ Quick-Connect Duke Energy 1606517 Milwaukee M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply Kit 2820-21WS