Roundup 190222 4-Gallon 2-IN-1 Professional Lawn & Garden Backpack Sprayer With 18-Inch Poly Wand and 3-Nozzle System High pressure chamber delivers up to 150 PSI which is ideal for spraying insecticides, low pressure regulator delivers a continuous 25 PSI which is ideal for spraying herbicides Most comfortable backpack with thick padded straps, waist belt and lumbar support, internal piston style pump will never leak on backside of the user. Three nozzle system for precision application of chemicals,first you have your brass adjustable, second is the flat fan and the third is the patented foaming nozzle Viton O-rings and seals offer maximum resistance to harsh chemicals 5 Year Warranty