4 gallon, high pressure chemical backpack applicator, sprayer has a connecting rod actuated piston pump capable of producing a wide pressure range up to 90 psi, ultraviolet resistant tank, felt padded polyester straps, heavy duty pressure cylinder, reversible pump lever, easy operating shut off valve, easily & effectively handles disinfectants,, fertilizers, herbicides, pest controls, etc., for tree, shrub & plant protection.