Chapin 64800 4-Gallon ProSeries Liquid and Wettable Powder Diaphragm Pump Backpack Sprayer For Fertilizer, Herbicides and Pesticides, 4-Gallon (1 Sprayer/Package) 4-Gallon translucent tank with 4-inch wide mouth opening for easy filling and cleaning Diaphragm pump provides compatibility with common fertilizers, weed killers and pesticides in both liquid and wettable powder form 3-Stage Filtration system with in-tank removable/cleanable filter Cushion grip poly shut-off with three nozzles for a variety of applications Padded shoulder straps to accommodate a full backpack for hours