Spectre's PCV Valve Breathers feature a 3/4 inch PCV valve integrated into the assembly. The breather replaces the PCV valves and provides a high quality breather appearance while allowing for emissions systems to operate as usual. Constructed using triple chrome-plated steel, this PCV valve breather features decorative O-rings for a show quality 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. Spectre s PCV Valve Breathers feature a 3/4 inch PCV valve integrated into the assembly. The breather replaces the PCV valves and provides a high quality breather appearance while allowing for emissions systems to operate as usual.