Billet Polished Canister Type Breather Box Features High Quality All Aluminum Construction With Removable Lid For Easy Servicing Of The Foam Element, Provisions For Up To Four Breather Lines And A Split Type Mounting Clamp That Makes Installation As Easy As Tightening Two Screws. Washable Foam Insert Separates Oil From Vapors While Keeping Out Dust And Dirt. Vapors Are Released From Vents Under The Cap.