For Acura Integra 3-Ply Silicone Radiator Coolant Hose (Red) - DA9 DB1 DB2 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 Hose Inlet Inner Diameter: 1.125" / Outlet Inner Diameter: 1.125" / Size (Diameter) Tolerance: +/- 0.225" Work With Factory or Aftermarket Radiators