Gates HK13RB Blue Racing Hose Kit Durable nylon fiber provides extra wear resistance, doubling tooth strength Kit contains 1-Upper radiator hose (22997 - 26.5 inch centerline length, 1.25 inch inner diameter) and 1-Lower radiator hose (22552 - 15.4 inch centerline length, 1.33 inch inner diameter). Protects against the high temperatures of full throttle driving Combats the leading cause of premature hose failure - electrochemical degradation (ECD) High saturation HNBR elastomeric composites contribute to the exceptional durability and heat resistance with aramid reinforcement