The Milwaukee® SWITCH TANK™ 4 Gallon water supply tank assembly is an interchangeable tank powered by the M18™ SWITCH TANK™ powered base (Nt included). The water supply tank assembly includes the pump, 10 Ft. hose, and quick-connect. The 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 an entire water supply. The 4 Gallon water supply tank assembly has a dual diaphragm pump for increased durability and longer pump life. The water supply tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank.