Spectre's Push-In 1 inch Valve Cover PCV Breather is manufactured from high quality polished billet aluminum. Featuring a smooth top design, this part has a 1 inch outside diameter neck and a replaceable PCV valve. Designed for universal compatibility, this breather is easy to install with no special skills or tools required. Best used with Spectre 1 inch diameter grommet - part number 5339. 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 1 inch Valve Cover PCV Breather is manufactured from high quality polished billet aluminum. Featuring a smooth top design; this part has a 1 inch outside diameter neck and a replaceable PCV valve.