The Koyorad hyper cap is crafted in Japan from high quality materials to ensure longevity and performace from your Koyo Racing Radiator.
The Hyper Cap withstands an increased valve pressure rating of 1.3kgf/cm2 (1.3 bar) (18.9 psi) (130 kPa) which increases the boiling point of water and relieves high performance engines of excessive heat. These are highly recommended for use with every Koyo Aluminum Radiator (when applicable).
