Manufactured from blue anodized 6061 aluminum. A direct upgrade replacement for the stock breather assembly. Inside you will find the proprietary Labyrinth design to significantly reduces oil pass-through, keeping your engine running cleaner and smoother while burning less oil. The S&S dual O-ring design offers a superior seal, minimizes leaks and maximizes performance. Maintenance-free since the mesh filter elements and the umbrella valves is no longer required. - 6061 aluminum construction - S&S blue anodized finish - Dual O-Ring for a improved sealing - Labyrinth design to significantly reduce oil pass-through - Less oil carry-over to the intake - Improved durability when compared to the stock breather assemblies - No more umbrella valve and mesh filter element so maintenance-free