The Greenworks 3120021639 trigger gun is an essential accessory designed for use with Greenworks electric pressure washers. It serves as a key interface for users, allowing precise control over the water flow and pressure, which is critical for effective cleaning. Engineered for comfort and efficiency, this trigger gun features an ergonomic design that reduces fatigue during extended use, making it ideal for a variety of cleaning tasks, from gentle washing of delicate surfaces to the removal of stubborn dirt and grime.