Our SWITCH TANK™ 4-Gallon Sprayer Tank Assembly is an interchangeable tank powered by the M18™ SWITCH TANK™ Powered Base (not included). The sprayer tank assembly includes the pump, hose, and wand. The design allows you to add on tank assemblies for different spraying 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 an entire sprayer. The 4-Gallon Sprayer Tank Assembly features a dual diaphragm pump for longer pump life and Viton® seals for increased durability against harsh chemicals. The sprayer tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank.