Product Details: Ensure your semi is Ready for the Road Ahead™ with a seamless transfer of engine coolant to the heater core, with the Gates 3/4" x 50' Green Stripe® Heavy-Duty Heater Hose. Thanks to its specialized design, this replacement hose is able to transport hot engine coolant to the heater core, where it is then used to blow warm air towards passengers in the cabin. Crafted with a heat-resistant body to efficiently transfer fluids throughout a system. FleetPride is your First Click in Heavy Duty®.