When working with compounds such as pesticides and herbicides, accuracy and control are top priorities. The STIHL SG 20 manual helps ensure constant working pressure, thanks to a pressurized fluid reservoir separate from the main tank. Now you can maintain constant pressure, even through refills. The sprayer is also comfortable and lightweight, helping you get through the day with less fatigue STIHL 18L Manual Backpack Sprayer SG 20