Durable, easy to use, and simple to maintain, STIHLs first manual backpack sprayer offers famous STIHL quality at a price point professionals will love. The SG 20 is comfortable to operate. And, at only 11.2 pounds (without fluid), its durable, lightweight polymer frame makes it easy to carry. When the job is done, the spray wand locks into a vertical position for transportation and storage. The manual backpack sprayer also offers convenience features including a large tank filler opening with strainer, a clear fluid level indicator, an adjustable brass nozzle for broadcast or pinpoint spraying. Made with efficient operation in mind, the SG 20 is equipped with an external piston pump to pressurize the SG 20s fluid reservoir. The reservoir is separate from the main tank, which makes it easier to maintain a working pressure of 40 psi, allowing for less pumping action. This feature also allows users to refill the main tank without a loss of pressure.