Not sure why they are sold as "Heater Hoses" as I have never seen a heater core with less than 5/8" hose. However, for the exhaust lines used on the HMMWV from the radiator to the expansion tank and from the adapter pipe to the expansion tank, this is an economical solution.It is always possible to purchase silicone hoses for this use and HMMWV suppliers offer these hoses.However, the original hose was not silicone and it is a cheaper and authentic replacement tube.
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