For Mazda RX-8 3-Ply Silicone Radiator Coolant Hose (Blue) - 1st Gen SE3P 3-Ply (4mm) Nylon for Strong Reinforcement Increases Engine Performance and Efficiency and Helps to Keep Engine Bay Temperatures Cooler Withstands Operating Temperatures up to 330F Degrees Fahrenheit Size (Diameter) Tolerance: +/- 0.225"; Direct Bolt-On Replacement of Factory Rubber Hoses Work With Factory or Aftermarket Radiators