Spectre's Push-in Valve Cover Breather features an internal baffle to prevent oil splash and provide superior ventilation. This breather was designed for valve covers with 1-1/4 inch holes. Ideal for use in conjunction with the grommet kit part number 5339, this breather includes a washable internal foam insert. This oil filler breather cap's triple chrome-plated steel construction and decorative O-rings ensure it performs as well as it looks. 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 Push-in Valve Cover Breather features an internal baffle to prevent oil splash and provide superior ventilation. This breather was designed for valve covers with 1-1/4 inch holes.