Item Notes: Tested and working $199 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 is powered by a 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. The RYOBI 18V 4 Gal. Backpack Chemical Sprayer includes a RYOBI 18V 2.0 Ah battery and charger. Works with all RYOBI 18V ONE+ Lithium batteries. . Click here for more information on Electronic Recycling Programs . Capacity (gallons): 4. Sprayer Features: Backpack. Includes: Sprayer Only. Compatible With: Chemical. Compatible With: Pesticide. Compatible With: Grass Killer. Compatible With: Weed Killer. Sprayer Features: Adjustable Spray Tip..