The 4 Gallon Deluxe Professional Backpack Sprayer is capable of producing up to 60 psi, with a high-performance connecting rod-actuated diaphragm pump system. The diaphragm is made of top quality material for its resistance to harsh chemicals, including bleach and for its long life expectancy. For spraying large jobs or small it is capable of performing virtually every spray ring task and will easily and effectively handle disinfectants, fungicides, herbicides, insecticides and fertilizers. The 475-B-DELUXE is designed with the ability to pass small abrasive particles without damage to the pump system and may be used with water from wells, lakes or rivers, which may contain sediment. The diaphragm backpack is ideal for handling chemicals in wet table powder form, liquid formulations and bleach solutions. Deluxe features include: Foldaway Handle, for easy storage and transport; Brass Adj. Nozzles, for multiple spraying tasks; Deluxe Padded Straps, for comfort; Pressure Regulating valve, provides four pressure settings - 15, 30, 45 and 60 psi; and a Pressure Gauge, which allows the user top monitor spraying pressure.