When it comes to letting your engine and valve covers breathe, Spectre has you covered in style. Spectre offers a wide range of push-in style breather sizes and styles to match the look you are going for under your hood. Our breathers include chrome and aluminum finishes, with various designs like standard dome, billet o-ring and ball milled styles. These breathers are designed to push into a 1 inch hole using a grommet to keep it in place. These products are legal in California only for racing vehicles which may never be used, registered, or licensed for use upon a highway. See spectreperformance.com for CARB status on each part for a specific vehicle.