Upgrade your tractor or trailer with our Candy Red Aluminum Screw-On Air Valve Knob with Stainless Plaque. The candy red finish adds a pop of color while the large screw-on knob with stainless steel plaque provides a durable and stylish accent. This product is sold individually and is available for both tractors and trailers. Enhance the look and functionality of your vehicle with this sleek and practical air valve knob.