Spectre's PCV Valve Breathers feature a 3/4 inch PCV valve integrated into the assembly. The breather replaces the PCV valves and provides breather looks while allowing for emissions systems to operate as usual. Constructed using triple chrome plated steel, Spectre's PCV valve breathers are manufactured using high quality materials ensuring they perform as well as they look. 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.