This Pearl White Aluminum Screw-On Air Valve Knob with Stainless Plaque is a practical and durable addition to any tractor or trailer. The large screw-on knob is easy to grip and features a stainless steel plaque for added strength. The pearl white finish adds a sleek and modern touch to your vehicle. Sold individually, this air valve knob is a reliable and affordable choice for any trucker or farmer.