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Thermo Tec Heat Sleeves

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01. These Heat Sleeves from Thermo-Tec are sealed with silicone-coated fiberglass fire sleeving to protect wires and hoses. As long as it does not come through the ends, these Heat Sleeves are mud and water proof as well. They insulate a little better than an easily-installed Express Sleeve, but you have to fish one end of the wires or tubing through, so they’re more difficult to install after the fact.