Ensure your semi truck is Ready for the Road Ahead™ with a seamless transfer of filtered air for combustion, with the Flex Technologies 4" x 6" Intake Charge Air Hose. Thanks 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. Crafted with a sunlight-resistant and flexible material to resist cracks and breaks. FleetPride is your First Click in Heavy Duty®.