Power Fist 8705998 is a 4-gallon backpack sprayer ideal for agricultural, pest control, and gardening applications. It features an ergonomic and durable design, with a piston pump that provides a pressure rating of 29 to 58 PSI. The sprayer comes with four spray heads that can be adjusted to produce a fine mist or a jet stream, and a 22.4-inch brass wand with a chrome finish and a 59-inch hose for maximum reach. It also has Viton seals for durability and is made of poly material for lightweight and resistance to chemicals.