Knapsack sprayer consists of a pump and an air chamber permanently installed in a 9 to 22.5 liters tank. The handle of the pump extending over the shoulder or under the arm of operator makes it possible to pump with one hand and spray with the other. It has a spray lance fitted with nozzle and has two straps for mounting the sprayer at the back of the operator. Uniform pressure can be maintained by keeping the pump in continuous operation.
