Heater hoses carry coolant between a vehicle's engine and its heater core in order to warm up the vehicle's interior. They are a part of the vehicle's cooling system that keeps the engine from overheating and malfunctioning. These hoses are made from materials that can withstand exposure to the chemicals and additives used in vehicle cooling systems. These small-diameter hoses are reinforced with nylon cords to strengthen the hose.
EPDM SAE 20R3 Class D2 Heater Hoses