the MILWAUKEE 4-Gallon Concrete Sprayer Tank Assembly is an interchangeable tank powered by the M18 Powered Base (not included). The concrete sprayer tank assembly includes the pump, hose, and wand. The 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 an entire sprayer. The 4-Gallon Concrete Sprayer Tank Assembly features a dual diaphragm pump for longer pump life and Viton seals for increased durability against harsh chemicals. The concrete sprayer tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank.