The GM 97241129 Front Thermostat is a factory replacement for your 2001-2018 GM 6.6L Duramax. This Thermostat features the same OE activation temp and is a drop-in replacement for the Front Thermostat equipped from the factory.
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Thermostat GM 97241129 and GM97241130 come with new gaskets?
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The GM97241129 and GM97241130 come with a rubber seal rings already attached to the thermostat. (You should purchase the upper radiator pipe seal as well as the oil tube seal when performing this job.)