Trailed Type Atomizer Spraying Machine It is connected to the tractor by the drawbar. The pressure required for spraying is provided by hydraulic membrane pumps. The pump takes its movement from the tractor PTO. Comet brand pumps are used as standard. A fiberglass (reinforced) or polyethylene tank is used as a spraying tank. The turbo fan on the machine provides compressed air to its surroundings with its propeller, which takes its movement from the tractor’s spindle.