This emission valve is a crucial component for ensuring that your vehicle meets the necessary emissions standards, making it an essential part for passing emissions control tests. Its compatibility with popular car models such as the MGMidget, MGB, and Cooper S models ensures that you can find the right valve for your vehicle. With no adverse effects on performance, this emission valve may even improve the overall performance of your vehicle. Additionally, the flat lid design of this valve is the perfect choice for later Cooper S models, making it an ideal fit for your specific vehicle. Say goodbye to the struggle of finding this commonly used device - it's finally available!