This lot of 2 NAPA AUTO CHOKE DIAPHRAGM parts includes the B&S 391681 and is compatible with several other interchange and OE/OEM part numbers. These high-quality carburetor parts are designed to improve the air and fuel delivery system on your car or truck. They are perfect for those who demand reliable and durable performance from their vehicles. Whether you are a professional mechanic or a DIY enthusiast, these NAPA parts are an excellent choice for your next project.