Elevate your RB/SR engine's performance with the HKS S Type Radiator Cap 108kPa from Terra Firma Automotive. This limited edition D1 radiator cap boasts a pressure rating of 108kPa (1.1kgf/cm2), showcasing your dedication to high-performance driving. Let the racing world know you mean business with the HKS pride and quality. Upgrade your radiator cap and experience the difference in your engine's cooling efficiency. Trust Terra Firma Automotive for top-notch products that deliver exceptional results on the track.