This TURBO Knapsack Sprayer pump produces a maximum 65 psi and takes only five pumps to reach 45 psi. Features an internal agitator for constant mixing, large fill opening, Santoprene piston cup has excellent chemical resistance for longer life and a high-density UV-resistant poly spray tank with volume markings in gallons and liters. It features an internally mounted brass piston pump to eliminate potentially dangerous external leaks The kensplastic  sprayer is ideal for the professional landscaper as well as the homeowner. The knapsack has a large opening for easy filling and cleaning. Nitrile seals provide compatibility with fertilizers, weeds killers and pesticides. 【Super Wide Opening Design】Designed with a wide mouth opening which is convenient and easy to pour the water into the bottle. The high density filter can effectively prevent big debris and dirt from entering the water tank, which protects internal components from damage and prolongs service life