The 4-Gallon Water Supply Tank Assembly is an interchangeable tank powered by the M18 Powered Base (not included). The water supply tank assembly includes the pump, 10-foot 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.