Agriscope Knapsack Sprayer is a highly durable, efficient sprayer ideal for outdoor work such as garden, vegetable plots or for crops. Its design makes it very light. 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 litters. This sprayer uses double valve technology which generates high pressure and also retains it while you spray.