Chapin 61813 4-Gallon Lawn/Landscape Pro Backpack Sprayer with Control Flow Valve Technology For Fertilizer, Herbicides and Pesticides, 4-Gallon (1 Sprayer/Package) Featuring Control Flow Valve Technology for a continuous spray stream at 21 psi and more efficient use of chemicals 4-Gallon 4-inch wide mouth opening, translucent tank for easy filling and cleaning Compatible with common fertilizers, weed killers and pesticides 3-Stage Filtration system with in tank removable/cleanable filter Poly shut-off with 3 nozzles - fan, cone and adjustable brass