Solo 4 Gallon Backpack Sprayer. It features a diaphragm pump with a carry handle for easy portability. The large 4.25" opening with filter basket makes filling convenient, while the 28" wand & shut off valve assembly, 4' high pressure hose, and padded nylon shoulder straps ensure comfortable spraying. Capable of producing up to 60 PSI, the diaphragm is made of top quality material for resistance to harsh chemicals and abrasion, passing small abrasive particles without damage to the pump assembly. Ideal for handling harsh chemicals in wettable powder form, liquid formulations, and bleach solutions.