The Field King Max Backpack Sprayer is a 4-gallon capacity backpack sprayer for lawn and garden use. It features a diaphragm pump that provides a max pressure of 60 PSI and can spray up to 25 feet horizontally. The tank is made of UV-resistant polyethylene with a 21-inch poly wand, adjustable brass nozzle tip, and Viton seals. It has padded shoulder straps and a waist belt for comfort. The Field King Max is ideal for applying pesticides, herbicides, fertilizers and other liquids to lawns, gardens, shrubs and trees.