Update your semi with a secure transfer of essential fluids throughout the cooling system, with the Tru-Flex 4" x 25' Medium Duty 409 Stainless Steel Flex Hose that ensures you're Ready for the Road Ahead. Thanks to its flexible design, this replacement hose is able to transfer coolant from the radiator to the engine to reduce heat and optimize motor performance. Crafted with incredible durability and improved bending strength to deliver a long service life, this flex hose also can be used on other systems including exhaust, air intake, and hydraulic systems. FleetPride is your First Click in Heavy Duty.