The Chapin Commercial Duty Jet Clean Dual Displacement Pump 4 gallon Backpack Sprayer (63900) is a backpack sprayer that is designed for herbicide and fertilizer applications. The Jet Clean is well known for agriculture, farm, livestock, turf, landscape, home and garden industries. It features 3 stage of filtration system which includes the strainer basket, filter in piston cylinder and filter in shut-off. It is also built with a 6 inch cap with handle that offers a huge backpack opening for convenience in filling and cleaning. Its mouth opening measures 6 inch wide for easy filling and for an effortless access to internal components of the sprayer. The piston and diaphragm pump configuration eradicates leaking from the pump and the in-tank removable filter efficiently catches anything that gets by the strainer when filling and fastens to the inlet filter at the piston. It features a swing-away handle for right or left hand use and folds up for storage.  Other than that, the Jet Clean is built with a self cleaning pump to keep the removable filter from blocking with undesirable debris. Once purchased, a variety of nozzles are included to help you determine volume of spray or its spray pattern.