Prepare your semi to be Ready for the Road Ahead™, with the Gates 5/8" x 50' Green Stripe® Heavy-Duty Heater Hose that provides a seamless transfer of engine coolant to the heater core. To blow warm air towards passengers in the cabin, this replacement hose transports hot engine coolant to the heater core. Fashioned with a heat-resistant body to efficiently transfer fluids throughout a system. FleetPride is your First Click in Heavy Duty®.