The Milwaukee M18 SWITCH TANK 4 Gal. Backpack Sprayer kit delivers the industry's first interchangeable tank design with no manual pumping. Designed to meet the needs of professional landscape maintenance, the battery-powered backpack sprayer provides users with instant, constant and adjustable pressure up to 120 psi and a 25 ft. spray distance. The 5-mode pressure adjustment knob adjusts the pressure between 20 psi to 120 psi, providing users with the capability to complete a wide range of applications. The M18 REDLITHIUM XC3.0 Battery provides users with up to 12 tanks of spraying per charge. The 4 Gal. Sprayer Tank Assembly features a dual diaphragm pump for longer pump life and Viton seals for increased durability against harsh chemicals. The sprayer tank has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank. The backpack frame includes wide straps providing users with added comfort during extended spraying applications and a handle for convenient transport and storage. This kit includes: 2 M18 SWITCH TANK Powered Base, SWITCH TANK 4 Gal. Sprayer Tank Assembly, 2 Stainless Steel Wand, Adjustable Nozzle, 2 Fan Nozzle, 2 Angled Nozzle Adaptor, 2 M18 REDLITHIUM XC3.0 Battery, 2 M18/M12 Multi-Voltage Charger.