Simple Operation: The foot-operated pneumatic valve is easy to use, making it easier and smoother to remove and mount tires during the repair process. TypeTire Changer. Unique Three-pedal/Four-pedal Design: The unique three-pedal/ four-pedal design ensures a significant increase in tire removal efficiency, responsible for forward and reverse rotation, tightening and loosening of the large disc jaws, and opening and closing of the large shovel.