Check the listing for details. Snap-On BF521A Air Filter Air Control Unit. Condition: New. Listed at 285.00 USD. This Snap-On BF521A Air Filter Air Control Unit is a must-have for any workshop or garage. With its all-pneumatic design, it is perfect for a variety of automotive air tool applications. The unit comes as a set, including a filter and air control unit, and is made by Snap-On, a trusted and reliable brand in the automotive industry. The BF521A is manufactured in China and is a unit type product. It is suitable for use in any workshop or garage, and its unit quantity of one makes it an affordable and practical addition to your tool collection. Whether you're a professional mechanic or a DIY enthusiast, this air filter and control unit is an essential tool that will help you get the job done right. Items are NEW, but we’re stored in a garage and not climate controlled. Boxes show some damage, and units may have slight corrosion on some fittings Request more pics if interested