The Milwaukee M18 SWITCH TANK 4 Gal. Backpack Water Supply kit delivers the industry's first interchangeable tank design with no manual pumping. Designed to meet user's 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 adjustment knob adjusts the pressure between 20 psi to 60 psi for ultimate control. The M18 REDLITHIUM XC3.0 Battery provides users with up to 12 tanks of water delivery per charge. The 4 Gal. Water Supply Tank Assembly 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 users with convenient transportation and storage. The 4 Gal. Water Supply is made up of 2 components the M18 SWITCH TANK Powered Base and the SWITCH TANK 4 Gal. Water Supply Tank Assembly. The Powered Base includes the motor, battery compartment and REDLINK electronics, while the interchangeable Tank Assembly includes the pump, 10 ft. hose and quick-connect. The isolated pump, hose and quick-connect design allows users to add on tank assemblies for different applications, eliminating cross-chemical contamination. It also provides users with the ability to replace the tank assembly at a lower cost of ownership compared to replacing the entire water supply.