Valve Covers: Valve covers not only prevent leaks, but also prevent dirt and rain from entering your bike or car. Different valve covers have different uses, French valve covers are mainly for bikes, American valve covers are mainly for most cars. Valve core. High quality brass nickel plated valve cores. Used to replace old valve leaks and rejuvenate tires. Stops air leakage from old valves. Universal compatible. Good airtightness. More durable, safe and reliable. SATISFACTION GUARANTEE: Our business philosophy is based on the quality of our products and services. If you are not completely satisfied with this product, just let us know and you will receive a full refund or replacement. VALVE CONVERTER: Converts American style valves to Schrader valves for use with bicycle pumps or air compressors. Built-in rubber seal, no air leakage. Color: Blue Size: 18*10mm Product List: 4*Valve Cover