The throttle control knob is an essential replacement part for your John Deere Z425, Z225, Z425, Z645 or Z665 lawn mower. This quality knob is designed to precisely control motor speed and power output, allowing you to mow at the optimal rate for your lawn conditions. Made from durable materials to withstand the rigors of outdoor use, this knob ensures smooth, responsive throttle control for many years. With its ergonomic design, it provides a comfortable grip and easy operation, reducing hand fatigue during prolonged cutting sessions. Compatible with select John Deere zero-turn lawnmowers, this throttle control knob is a must-have for maintaining peak performance and ensuring a well-manicured lawn. Replace your worn or damaged knob.