Our SWITCH TANK 15L Water Supply Tank Assembly is an interchangeable tank Powered by the M18 SWITCH TANK Powered Base (not included). The water supply tank assembly includes the pump and 3m hose with Quick-Connect. The design allows you to add on tank assemblies for different applications, eliminating cross-chemical contamination. It also provides the ability to replace the tank assembly at a lower cost of ownership, compared to replacing an entire water supply. The 15L Water Supply Tank Assembly features 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.