Spectre's Valve Cover Breather Push-in features an internal baffle to prevent oil splash and provide superior ventilation. This valve cover breather was designed for all valve covers with 1-1/4 inch breather holes. A rubber grommet is included to push in the 1 inch outside diameter neck. Manufactured from steel with a triple chrome plated finish, this oil filler breather cap features a smooth design to ensure it looks as well as it performs. Note: 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. Spectre s Valve Cover Breather Push-in features an internal baffle to prevent oil splash and provide superior ventilation. This valve cover breather was designed for 1-1/4 inch breather holes.