A 4-Stroke Knapsack Sprayer is a petrol-powered backpack sprayer designed for fast and efficient spraying of pesticides, herbicides, fungicides, foliar fertilizers, and disinfectants. Unlike 2-stroke models, it uses separate petrol and engine oil, making it more fuel-efficient, quieter, and easier to maintain. It is ideal for farms, orchards, plantations, and livestock tick control. �