The Heavy Duty Air Shift Knob is a reliable and practical product designed for air transmissions. Made with a combination of plastic and aluminum construction materials, it features a sleek black finish and a round ball shift knob style. This shift knob is a direct replacement for a proper fit and can be easily installed without the need for special tools. Quality tested for trouble-free performance, it fits most makes and models and is a direct OE replacement for Mack 3088-A6909 and Freightliner FUL A6909. Upgrade your air transmission with this durable and easy-to-install shift knob.