Product guaranteed for years of durability Fits all standard auto air valves Waterproof design these tire valve caps are fitted with inner "O" ring seal to secure a clean valve orifice and consistent tire pressure. Installation Very beautiful Easy to install, Only screws onto tire valve stem. The valve stem cap are durable, rustless, antioxidant in extreme weathe, Will not be corroded. Valve Cap will fit on standard tire stem Prevent foreign matter from blocking the valve core. BMW. Brand New, Never Used.