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4gal Piston Backpack Sprayer. The want has an overall length of 28-inches and includes an easy to use shut-off valve. The sprayer also includes padded shoulder straps for greater comfort and a 4-foot long high pressure hose. Chemically resistant Viton seals give you an added layer of protection. With its connecting rod activated piston pump, the Piston Backpack Sprayer is capable of producing a wide pressure range of up to 90 P.S.I. and is capable of performing virtually every spraying task. It easily and effectively handles disinfectants, fertilizers, herbicides, pesticides, and formulations for tree, shrub, and plant protection (clean sprayer between use). The rugged, high-density polyethylene tank and internal Viton seals ensure long life and durability.