The Koyo Radiator Hyper cap is designed to increase the opening and closing pressure of your car's cooling system. The increase in pressure to 1.3kg/cm2 / 127kPa allows an improvement in cooling system efficiency. The under cap seal is made from high-temperature silicone rubber and improves sealing characteristics. This cap will work with the MK3/MK4 Supra, SW20 MR2, and the Lexus IS300 with KOYO radiators.
Please note this radiator cap may not work with your stock radiator.
