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- Carried on the user’s back.
- Used mostly for commercial applications.
- Made of either polyethylene or metal.
- Operates similar to a compressed air sprayer, but can handle a larger capacity.
- Steady pumping maintains a constant pressure, which produces a uniform discharge rate and spray pattern. Some models only require intermittent pumping.
- Capacity ranges from 3-1/2 to 5 gallons.