Outfit your semi truck to be Ready for the Road Ahead with a seamless transfer of filtered air for combustion, with the Flex Technologies 4" x 8" Intake Charge Air Hose. With a durable composition, this replacement hose works to transfer clean air from the air filter to the engine, where it is then used in the combustion process. Manufactured with a flexible and sunlight-resistant material to resist cracks and breaks. FleetPride is your First Click in Heavy Duty .