K&N crankcase vent filters are perfect for racing applications, vintage cars or individuals who want to add some aesthetics to their classic carbureted engine. The crankcase vent filter has a K&N embossed chrome-plated steel top with a black rubber base. The zinc tube is designed to push in and clamp directly on to metal or plastic tubing where venting is needed. Constructed with a synthetic filter media, it can be cleaned and reused repeatedly. Zinc tube. Chrome-plated steel top and rubber base. Mounts directly into rubber grommets in valve covers. Washable and reusable filter media. Note: Legal in California ONLY for racing vehicles which may never be used, registered, or licensed for use upon a highway. Detailed Specifications: K&N part number: 62-1000. Vent outside diameter: 0.375 inches (10 mm). Outside diameter: 2 inches (51 mm).