The Electric Yellow Deluxe Screw-On Aluminum Air Valve Knob with Stainless Plaque is a practical and stylish addition to any tractor or trailer. Its electric yellow finish adds a pop of color, while the large screw-on deluxe knob with stainless steel plaque provides a durable and long-lasting design. This product is sold individually and fits most makes and models, making it a versatile and convenient option for those in need of a reliable air valve knob.