Gates HK19RB Blue Racing Hose Kit Durable nylon fiber provides extra wear resistance, doubling tooth strength Kit contains 1-Upper radiator hose (22165 - 14.1 inch centerline length, 1.19 inch inner diameter) and 1-Lower radiator hose (22181 - 34.5 inch centerline length, 1.2 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