Our M18™ SWITCH TANK™ 4 gal 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 to 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 gal 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 gal water supply is made up of two 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 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 gal concrete sprayer and 4 gal sprayer tank assemblies. The M18™ SWITCH TANK™ 4 gal 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 4 gal concrete sprayer is made up of two components-the M18™ SWITCH TANK™ powered base and the SWITCH TANK™ 4 gal concrete sprayer tank assembly.