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The Milwaukee M18 Switch Tank 4 Gal. backpack water supply kit is the industrys first interchangeable tank design with no manual pumping. Designed to meet 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 to 60 psi for ultimate control. The 4 Gal. water supply tank assembly has 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 for 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. The interchangeable tank assembly includes the pump 10 ft hose and quick-connect. The isolated pump hose and quick-connect design allows tank assemblies to be added for different applications eliminating cross-chemical contamination. It also allows tank assemblies to be replaced 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 49-16-28CS and 4 Gal. sprayer 49-16-28PS 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. The kit also includes one M18 Redlithium XC3.0 battery and an M18/M12 multi-voltage charger.