The Milwaukee 4-Gallon Sprayer Tank Assembly with SWITCH TANK™ is an interchangeable tank powered by the M18™ Powered Base with SWITCH TANK™ (not included). The sprayer tank assembly includes the pump, hose and wand. The design allows you to add on tank assemblies for different applications, eliminating cross-chemical contamination. 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.