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The SP Systems Piston 4-gallon 120 psi backpack sprayer comes with an external piston pump capable of generating a maximum 120 psi of pressure. It features heavy-duty adjustable padded shoulder straps, Viton/Nytril seals and O-ring for extended life, a 20-inch brass wand, and adjustable brass nozzle with fanning capabilities. The 4-gallon backpack sprayer also includes 47-inches of industrial hose, a solid steel pump handle, pump handle grip, lid carrying handle, pistol grip and filter, and tank mouth strainer that fits onto the 6-inch tank mouth. The backpack sprayer measures approximately 22-by-15-inches and is capable of applying herbicides, insecticides, liquid fertilizers, and diesel, as well as working with oil or solvent-based products. It is backed by a 6-month limited manufacturer's warranty.