Update your semi truck with a seamless transfer of filtered air for combustion, with the Flex Technologies 4" x 6" Intake Charge Air Hose that ensures you're Ready for the Road Ahead™. Due to its rugged 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. Constructed with a flexible and sunlight-resistant material to resist cracks and breaks. FleetPride is your First Click in Heavy Duty®.