The Big Circuit Regulator with Black Knob is a heavy-duty component designed to control power flow and motor speed in agricultural battery sprayers. Constructed with durable electronic circuitry, it allows farmers to regulate spraying pressure and output with ease, ensuring accurate application of pesticides, herbicides, and fertilizers. The sturdy black knob offers smooth manual adjustment, making operation user-friendly even during long fieldwork. Compatible with various battery-operated sprayers, it improves efficiency, extends motor life, and ensures consistent performance. Easy to install and replace, this regulator is a practical spare part for knapsack sprayers and farm spraying equipment. Reliable and long-lasting, it is an essential addition for efficient crop protection and spraying tasks.