Milwaukee M18™ SWITCH TANK™ 4-gal Backpack Sprayer a versatile and efficient solution for spraying tasks with its innovative interchangeable tank design that requires no manual pumping. This sprayer delivers up to 120 PSI and reaches a spray distance of 25 feet, making it i for various applications. The 5-mode pressure adjustment knob allows you to easily control the pressure between 20 and 120 PSI for customized performance. Equipped with a durable dual diaphragm pump featuring Viton® seals, it ensures long-lasting resistance to chemicals. The wide mouth opening simplifies filling, while the built-in strainer helps filter out debris. Designed for comfort, the backpack frame includes wide straps to reduce fatigue during extended use. The Interchangeable Tank Assembly incorporates an isolated pump, hose, and wand, enabling you to add additional tank assemblies without the risk of cross-contamination. This package includes one M18™ SWITCH TANK™ Powered Base (2820-20) and one SWITCH TANK™ 4-Gallon Sprayer Tank Assembly (49-16-28PS). Model Number: 2820-20PS