The RYOBI 18V ONE+ 4 Gal. Backpack Chemical Sprayer combines the convenience of a cordless sprayer with a backpack design to allow you to work quickly and comfortably. This sprayer can be powered by any RYOBI 18V ONE+ battery and sprays up to 11 tanks per charge - with no pumping required. It comes equipped with a variable dial to allow you to adjust to your desired pressure, and an adjustable spray and flat fan nozzle for the versatility to spray for a variety of applications. The large, translucent 4 Gal. tank allows you to take on larger jobs and easily monitor your fluid levels while you work.